diff --git a/compat/mingw.c b/compat/mingw.c
index f464fdb63d..befdb147ca 100644
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -315,10 +315,6 @@ char *mingw_getcwd(char *pointer, int len)
 	return ret;
 }
 
-void sync(void)
-{
-}
-
 void openlog(const char *ident, int option, int facility)
 {
 }
diff --git a/git-compat-util.h b/git-compat-util.h
index 71887ee6ae..d0c0884fc9 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -505,9 +505,9 @@ int mingw_socket(int domain, int type, int protocol);
 int mingw_rename(const char*, const char*);
 #define rename mingw_rename
 
-#define setlinebuf(x)
-#define fsync(x) 0
-#define getppid() 1
+static inline int fsync(int fd) { return 0; }
+static inline int getppid(void) { return 1; }
+static inline void sync(void) {}
 
 extern void quote_argv(const char **dst, const char **src);
 extern const char *parse_interpreter(const char *cmd);