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-rw-r--r--src/os/os.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/os/os.h b/src/os/os.h
index 2bfcd8f162..0a6bb067e2 100644
--- a/src/os/os.h
+++ b/src/os/os.h
@@ -5,7 +5,7 @@
long_u mch_total_mem(int special);
int mch_chdir(char *path);
-int mch_dirname(char_u *buf, int len);
+int mch_dirname(char_u *buf, size_t len);
int mch_get_absolute_path(char_u *fname, char_u *buf, int len, int force);
int mch_is_absolute_path(const char_u *fname);
int mch_isdir(const char_u *name);