diff --git a/compat/mingw.c b/compat/mingw.c
index e7834ed196..13f242948d 100644
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -1292,8 +1292,7 @@ static int lookup_env(char **env, const char *name, size_t nmln)
 	int i;
 
 	for (i = 0; env[i]; i++) {
-		if (0 == strncmp(env[i], name, nmln)
-		    && '=' == env[i][nmln])
+		if (!strncasecmp(env[i], name, nmln) && '=' == env[i][nmln])
 			/* matches */
 			return i;
 	}