diff --git a/source/amx/amx.c b/source/amx/amx.c
index 675576f..3331d30 100644
--- a/source/amx/amx.c
+++ b/source/amx/amx.c
@@ -484,26 +484,28 @@ int AMXAPI amx_Callback(AMX *amx, cell index, cell *result, const cell *params)
     if ((amx->flags & AMX_FLAG_JITC)!=0)
       assert(amx->sysreq_d==0);
   #endif
-  if (amx->sysreq_d!=0) {
-    /* at the point of the call, the CIP pseudo-register points directly
-     * behind the SYSREQ instruction and its parameter(s)
-     */
-    unsigned char *code=amx->base+(int)hdr->cod+(int)amx->cip-sizeof(cell);
-    assert(amx->cip >= 4 && amx->cip < (hdr->dat - hdr->cod));
-    assert_static(sizeof(f)<=sizeof(cell)); /* function pointer must fit in a cell */
-    if (amx->flags & AMX_FLAG_SYSREQN)		/* SYSREQ.N has 2 parameters */
-      code-=sizeof(cell);
-#if defined __GNUC__ || defined __ICC || defined ASM32
-    if (*(cell*)code==index) {
-#else
-    if (*(cell*)code!=OP_SYSREQ_PRI) {
-      assert(*(cell*)(code-sizeof(cell))==OP_SYSREQ_C || *(cell*)(code-sizeof(cell))==OP_SYSREQ_N);
-      assert(*(cell*)code==index);
-#endif
-      *(cell*)(code-sizeof(cell))=amx->sysreq_d;
-      *(cell*)code=(cell)f;
+  #if PAWN_POINTER_SIZE <= PAWN_CELL_SIZE
+    if (amx->sysreq_d!=0) {
+      /* at the point of the call, the CIP pseudo-register points directly
+      * behind the SYSREQ instruction and its parameter(s)
+      */
+      unsigned char *code=amx->base+(int)hdr->cod+(int)amx->cip-sizeof(cell);
+      assert(amx->cip >= 4 && amx->cip < (hdr->dat - hdr->cod));
+      assert_static(sizeof(f)<=sizeof(cell)); /* function pointer must fit in a cell */
+      if (amx->flags & AMX_FLAG_SYSREQN)		/* SYSREQ.N has 2 parameters */
+        code-=sizeof(cell);
+    #if defined __GNUC__ || defined __ICC || defined ASM32
+      if (*(cell*)code==index) {
+    #else
+      if (*(cell*)code!=OP_SYSREQ_PRI) {
+        assert(*(cell*)(code-sizeof(cell))==OP_SYSREQ_C || *(cell*)(code-sizeof(cell))==OP_SYSREQ_N);
+        assert(*(cell*)code==index);
+    #endif
+        *(cell*)(code-sizeof(cell))=amx->sysreq_d;
+        *(cell*)code=(cell)f;
+      } /* if */
     } /* if */
-  } /* if */
+  #endif
 
   /* Note:
    *   params[0] == number of bytes for the additional parameters passed to the native function
diff --git a/source/amx/amx.h b/source/amx/amx.h
index 022d751..2cbe3d4 100644
--- a/source/amx/amx.h
+++ b/source/amx/amx.h
@@ -178,6 +178,16 @@ extern  "C" {
   #error Unsupported cell size (PAWN_CELL_SIZE)
 #endif
 
+#if !defined PAWN_POINTER_SIZE
+  #if INTPTR_MAX==INT64_MAX
+    #define PAWN_POINTER_SIZE 64
+  #elif INTPTR_MAX==INT32_MAX
+    #define PAWN_POINTER_SIZE 32
+  #else
+    #error Unknown pointer size
+  #endif
+#endif
+
 #define UNPACKEDMAX   (((cell)1 << (sizeof(cell)-1)*8) - 1)
 #define UNLIMITED     (~1u >> 1)
 
diff --git a/source/compiler/CMakeLists.txt b/source/compiler/CMakeLists.txt
index b2aa8a9..f1e6c3b 100644
--- a/source/compiler/CMakeLists.txt
+++ b/source/compiler/CMakeLists.txt
@@ -44,6 +44,12 @@ if(HAVE_STRLCAT)
   add_definitions(-DHAVE_STRLCAT)
 endif()
 
+if(CMAKE_SIZEOF_VOID_P EQUAL 4)
+  add_definitions(-DPAWN_POINTER_SIZE=32)
+elseif(CMAKE_SIZEOF_VOID_P EQUAL 8)
+  add_definitions(-DPAWN_POINTER_SIZE=64)
+endif()
+
 if(MSVC)
   add_definitions(-D_CRT_SECURE_NO_WARNINGS -D_CRT_NONSTDC_NO_DEPRECATE)
   if(MSVC LESS 1900)
diff --git a/source/compiler/sc.h b/source/compiler/sc.h
index a418350..9a8cfef 100644
--- a/source/compiler/sc.h
+++ b/source/compiler/sc.h
@@ -52,7 +52,7 @@
   #if !defined __x86_64__ && !defined __amd64__ && (__GNUC__>=4 || __GNUC__==3 && __GNUC_MINOR__>=4)
     #define SC_FASTCALL __attribute__((fastcall))
   #else
-    #define SC_FASTCALL __attribute__((regparam(3)))
+    #define SC_FASTCALL __attribute__((regparm(3)))
   #endif
 #endif
 #if !defined SC_FASTCALL