diff --git a/src/mzscheme/src/file.c b/src/mzscheme/src/file.c
index c6ed28b09b..54a3d6c459 100644
--- a/src/mzscheme/src/file.c
+++ b/src/mzscheme/src/file.c
@@ -3382,6 +3382,9 @@ int scheme_is_complete_path(const char *s, long len, int kind)
   if (!len)
     return 0;
 
+  if (!kind)
+    kind = SCHEME_PLATFORM_PATH_KIND;
+
   if (!scheme_is_relative_path(s, len, kind)) {
     if (kind == SCHEME_WINDOWS_PATH_KIND) {
       if (IS_A_DOS_SEP(s[0]) && IS_A_DOS_SEP(s[1])) {
diff --git a/src/wxmac/src/mac/wx_dialg.cc b/src/wxmac/src/mac/wx_dialg.cc
index 0a6e5bafe2..f20091d8aa 100644
--- a/src/wxmac/src/mac/wx_dialg.cc
+++ b/src/wxmac/src/mac/wx_dialg.cc
@@ -258,7 +258,7 @@ extern "C" {
 #endif
 extern "C" {
   extern char *scheme_expand_filename(char* filename, int ilen, const char *errorin, int *ex, int guards);
-  extern int scheme_is_complete_path(const char *s, long len);
+  extern int scheme_is_complete_path(const char *s, long len, int kind);
   extern int scheme_file_exists(const char *s);
   extern char *scheme_find_completion(char *fn);
 }
@@ -406,10 +406,11 @@ static OSStatus tab_evt_handler(EventHandlerCallRef inHandlerCallRef,
     result = extract_string(ccbi);
     len = strlen(result);
 
-    if (scheme_is_complete_path(result, len)) {
+    if (scheme_is_complete_path(result, len, 0)) {
       result = scheme_find_completion(result);
-    } else
+    } else {
       result = NULL;
+    }
 
     if (result) {
       CFStringRef str;