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-rw-r--r--lib-src/emacsclient.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib-src/emacsclient.c b/lib-src/emacsclient.c
index 5e8b563984d..6970c1ab9a4 100644
--- a/lib-src/emacsclient.c
+++ b/lib-src/emacsclient.c
@@ -451,7 +451,7 @@ file_name_absolute_p (filename)
#ifdef WINDOWSNT
/* X:\xxx is always absolute; X:xxx is an error and will fail. */
- if (islower (tolower (filename[0]))
+ if (isalpha (filename[0])
&& filename[1] == ':' && (filename[2] == '\\' || filename[2] == '/'))
return TRUE;