diff --git a/source/amx/osdefs.h b/source/amx/osdefs.h
index 29804ab..2ee7957 100644
--- a/source/amx/osdefs.h
+++ b/source/amx/osdefs.h
@@ -66,6 +66,9 @@
   #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 ee61984..fc3aa67 100644
--- a/source/compiler/sc2.c
+++ b/source/compiler/sc2.c
@@ -183,7 +183,8 @@ 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) {
+      if ((ptr=strrchr(inpfname,DIRSEP_CHAR))!=0 |
+          (ptr=strrchr(inpfname,DIRSEP_CHAR_SI))!=0) {
         int len=(int)(ptr-inpfname)+1;
         if (len+strlen(name)<_MAX_PATH) {
           char path[_MAX_PATH];
@@ -268,6 +269,8 @@ 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) {