diff --git a/src/gtkglue.c b/src/gtkglue.c
index 9a3297e..fcc0b7e 100644
--- a/src/gtkglue.c
+++ b/src/gtkglue.c
@@ -151,6 +151,13 @@ gsg_make_path (size_t buf_size, char *buf,
 	      buf[len++] = '-';
 	      break;
 
+#ifdef OS2
+	    case ':': /* OS2 can not handle colons in filenames */
+	      buf[len++] = '+';
+	      buf[len++] = '_';
+	      break;
+#endif
+
 	    case '+':
 	      buf[len++] = '+';
 	    default: