diff --git a/source/amx/osdefs.h b/source/amx/osdefs.h
index 2ee7957..29804ab 100644
--- a/source/amx/osdefs.h
+++ b/source/amx/osdefs.h
@@ -66,9 +66,6 @@
   #define DIRSEP_CHAR '/'   /* directory separator character */
 #endif
 
-/* system-independent directory separator */
-#define DIRSEP_CHAR_SI '/'
-
 /* _MAX_PATH is sometimes called differently and it may be in limits.h or
  * stdlib.h instead of stdio.h.
  */
diff --git a/source/compiler/sc2.c b/source/compiler/sc2.c
index fc3aa67..ee61984 100644
--- a/source/compiler/sc2.c
+++ b/source/compiler/sc2.c
@@ -183,8 +183,7 @@ SC_FUNC int plungefile(char *name,int try_currentpath,int try_includepaths)
        * there is a (relative) path for the current file
        */
       char *ptr;
-      if ((ptr=strrchr(inpfname,DIRSEP_CHAR))!=0 |
-          (ptr=strrchr(inpfname,DIRSEP_CHAR_SI))!=0) {
+      if ((ptr=strrchr(inpfname,DIRSEP_CHAR))!=0) {
         int len=(int)(ptr-inpfname)+1;
         if (len+strlen(name)<_MAX_PATH) {
           char path[_MAX_PATH];
@@ -269,8 +268,6 @@ static void doinclude(int silent)
   strcpy(symname,"_inc_");
   if ((ptr=strrchr(name,DIRSEP_CHAR))!=NULL)
     strlcat(symname,ptr+1,sizeof symname);
-  else if ((ptr=strrchr(name,DIRSEP_CHAR_SI))!=NULL)
-    strlcat(symname,ptr+1,sizeof symname);
   else
     strlcat(symname,name,sizeof symname);
   if (find_symbol(&glbtab,symname,fcurrent,-1,NULL)==NULL) {