diff --git a/lapi.c b/lapi.c
index aa2ee735..dcdc1cd3 100644
--- a/lapi.c
+++ b/lapi.c
@@ -1186,25 +1186,11 @@ LUA_API int lua_gc (lua_State *L, int what, ...) {
       break;
     }
     case LUA_GCGEN: {
-#if defined(LUA_COMPAT_GCPARAMS)
-      int minormul = va_arg(argp, int);
-      int minormajor = va_arg(argp, int);
-      if (minormul > 0) setgcparam(g, MINORMUL, minormul);
-      if (minormajor > 0) setgcparam(g, MINORMAJOR, minormajor);
-#endif
       res = (g->gckind == KGC_INC) ? LUA_GCINC : LUA_GCGEN;
       luaC_changemode(L, KGC_GENMINOR);
       break;
     }
     case LUA_GCINC: {
-#if defined(LUA_COMPAT_GCPARAMS)
-      int pause = va_arg(argp, int);
-      int stepmul = va_arg(argp, int);
-      int stepsize = va_arg(argp, int);
-      if (pause > 0) setgcparam(g, PAUSE, pause);
-      if (stepmul > 0) setgcparam(g, STEPMUL, stepmul);
-      if (stepsize > 0) setgcparam(g, STEPSIZE, 1u << stepsize);
-#endif
       res = (g->gckind == KGC_INC) ? LUA_GCINC : LUA_GCGEN;
       luaC_changemode(L, KGC_INC);
       break;
diff --git a/lbaselib.c b/lbaselib.c
index 03df57f8..a9d39e9f 100644
--- a/lbaselib.c
+++ b/lbaselib.c
@@ -213,8 +213,7 @@ static int luaB_collectgarbage (lua_State *L) {
       return 1;
     }
     case LUA_GCSTEP: {
-      int step = (int)luaL_optinteger(L, 2, 0);
-      int res = lua_gc(L, o, step);
+      int res = lua_gc(L, o);
       checkvalres(res);
       lua_pushboolean(L, res);
       return 1;
@@ -226,26 +225,10 @@ static int luaB_collectgarbage (lua_State *L) {
       return 1;
     }
     case LUA_GCGEN: {
-#if defined(LUA_COMPAT_GCPARAMS)
-      int minormul = (int)luaL_optinteger(L, 2, -1);
-      int majorminor = (int)luaL_optinteger(L, 3, -1);
-#else
-      int minormul = 0;
-      int majorminor = 0;
-#endif
-      return pushmode(L, lua_gc(L, o, minormul, majorminor));
+      return pushmode(L, lua_gc(L, o));
     }
     case LUA_GCINC: {
-#if defined(LUA_COMPAT_GCPARAMS)
-      int pause = (int)luaL_optinteger(L, 2, -1);
-      int stepmul = (int)luaL_optinteger(L, 3, -1);
-      int stepsize = (int)luaL_optinteger(L, 4, -1);
-#else
-      int pause = 0;
-      int stepmul = 0;
-      int stepsize = 0;
-#endif
-      return pushmode(L, lua_gc(L, o, pause, stepmul, stepsize));
+      return pushmode(L, lua_gc(L, o));
     }
     case LUA_GCSETPARAM: {
       static const char *const params[] = {
diff --git a/ltests.h b/ltests.h
index 70afa7a3..da773d6e 100644
--- a/ltests.h
+++ b/ltests.h
@@ -15,8 +15,6 @@
 #define LUA_COMPAT_MATHLIB
 #define LUA_COMPAT_LT_LE
 
-#define LUA_COMPAT_GCPARAMS
-
 
 #define LUA_DEBUG
 
diff --git a/lua.c b/lua.c
index 1e884b07..e574ec9b 100644
--- a/lua.c
+++ b/lua.c
@@ -646,7 +646,7 @@ static int pmain (lua_State *L) {
   luai_openlibs(L);  /* open standard libraries */
   createargtable(L, argv, argc, script);  /* create table 'arg' */
   lua_gc(L, LUA_GCRESTART);  /* start GC... */
-  lua_gc(L, LUA_GCGEN, 0, 0);  /* ...in generational mode */
+  lua_gc(L, LUA_GCGEN);  /* ...in generational mode */
   if (!(args & has_E)) {  /* no option '-E'? */
     if (handle_luainit(L) != LUA_OK)  /* run LUA_INIT */
       return 0;  /* error running LUA_INIT */
diff --git a/testes/gc.lua b/testes/gc.lua
index 61b5da9c..8bacffa0 100644
--- a/testes/gc.lua
+++ b/testes/gc.lua
@@ -504,7 +504,7 @@ end
 do
   collectgarbage()
   collectgarbage"stop"
-  collectgarbage("step", 0)   -- steps should not unblock the collector
+  collectgarbage("step")   -- steps should not unblock the collector
   local x = gcinfo()
   repeat
     for i=1,1000 do _ENV.a = {} end   -- no collection during the loop
diff --git a/testes/gengc.lua b/testes/gengc.lua
index cae07285..51872cc1 100644
--- a/testes/gengc.lua
+++ b/testes/gengc.lua
@@ -24,12 +24,12 @@ do
   assert(not T or (T.gcage(U) == "touched1" and T.gcage(U[1]) == "new"))
 
   -- both U and the table survive one more collection
-  collectgarbage("step", 0)
+  collectgarbage("step")
   assert(not T or (T.gcage(U) == "touched2" and T.gcage(U[1]) == "survival"))
 
   -- both U and the table survive yet another collection
   -- now everything is old
-  collectgarbage("step", 0)
+  collectgarbage("step")
   assert(not T or (T.gcage(U) == "old" and T.gcage(U[1]) == "old1"))
 
   -- data was not corrupted
@@ -46,10 +46,10 @@ do
   assert(not T or T.gcage(old) == "old")
   setmetatable(old, {})    -- new table becomes OLD0 (barrier)
   assert(not T or T.gcage(getmetatable(old)) == "old0")
-  collectgarbage("step", 0)   -- new table becomes OLD1 and firstold1
+  collectgarbage("step")   -- new table becomes OLD1 and firstold1
   assert(not T or T.gcage(getmetatable(old)) == "old1")
   setmetatable(getmetatable(old), {__gc = foo})  -- get it out of allgc list
-  collectgarbage("step", 0)   -- should not seg. fault
+  collectgarbage("step")   -- should not seg. fault
 end
 
 
@@ -65,18 +65,18 @@ do   -- bug in 5.4.0
     A[1] = obj     -- anchor object
     assert(not T or T.gcage(obj) == "old1")
     obj = nil      -- remove it from the stack
-    collectgarbage("step", 0)   -- do a young collection
+    collectgarbage("step")   -- do a young collection
     print(getmetatable(A[1]).x)   -- metatable was collected
   end
 
   collectgarbage()   -- make A old
   local obj = {}     -- create a new object
-  collectgarbage("step", 0)   -- make it a survival
+  collectgarbage("step")   -- make it a survival
   assert(not T or T.gcage(obj) == "survival")
   setmetatable(obj, {__gc = gcf, x = "+"})   -- create its metatable
   assert(not T or T.gcage(getmetatable(obj)) == "new")
   obj = nil   -- clear object
-  collectgarbage("step", 0)   -- will call obj's finalizer
+  collectgarbage("step")   -- will call obj's finalizer
 end
 
 
@@ -94,13 +94,13 @@ do   -- another bug in 5.4.0
     end
   )
   local _, f = coroutine.resume(co)   -- create closure over 'x' in coroutine
-  collectgarbage("step", 0)   -- make upvalue a survival
+  collectgarbage("step")   -- make upvalue a survival
   old[1] = {"hello"}    -- 'old' go to grayagain as 'touched1'
   coroutine.resume(co, {123})     -- its value will be new
   co = nil
-  collectgarbage("step", 0)   -- hit the barrier
+  collectgarbage("step")   -- hit the barrier
   assert(f() == 123 and old[1][1] == "hello")
-  collectgarbage("step", 0)   -- run the collector once more
+  collectgarbage("step")   -- run the collector once more
   -- make sure old[1] was not collected
   assert(f() == 123 and old[1][1] == "hello")
 end
@@ -112,12 +112,12 @@ do   -- bug introduced in commit 9cf3299fa
   assert(not T or T.gcage(t) == "old")
   t[1] = {10}
   assert(not T or (T.gcage(t) == "touched1" and T.gccolor(t) == "gray"))
-  collectgarbage("step", 0)   -- minor collection
+  collectgarbage("step")   -- minor collection
   assert(not T or (T.gcage(t) == "touched2" and T.gccolor(t) == "black"))
-  collectgarbage("step", 0)   -- minor collection
+  collectgarbage("step")   -- minor collection
   assert(not T or T.gcage(t) == "old")   -- t should be black, but it was gray
   t[1] = {10}      -- no barrier here, so t was still old
-  collectgarbage("step", 0)   -- minor collection
+  collectgarbage("step")   -- minor collection
   -- t, being old, is ignored by the collection, so it is not cleared
   assert(t[1] == nil)   -- fails with the bug
 end
@@ -144,13 +144,13 @@ do
          T.gcage(debug.getuservalue(U)) == "new")
 
   -- both U and the table survive one more collection
-  collectgarbage("step", 0)
+  collectgarbage("step")
   assert(T.gcage(U) == "touched2" and
          T.gcage(debug.getuservalue(U)) == "survival")
 
   -- both U and the table survive yet another collection
   -- now everything is old
-  collectgarbage("step", 0)
+  collectgarbage("step")
   assert(T.gcage(U) == "old" and
          T.gcage(debug.getuservalue(U)) == "old1")