Mark debug message functions static
diff --git a/src/hb-private.hh b/src/hb-private.hh
index 43b6e8a..42c0259 100644
--- a/src/hb-private.hh
+++ b/src/hb-private.hh
@@ -546,7 +546,7 @@
#define DEBUG_LEVEL(WHAT, LEVEL) (_hb_debug ((LEVEL), HB_DEBUG_##WHAT))
#define DEBUG(WHAT) (DEBUG_LEVEL (WHAT, 0))
-template <int max_level> inline void
+template <int max_level> static inline void
_hb_debug_msg_va (const char *what,
const void *obj,
const char *func,
@@ -608,7 +608,7 @@
const char *message HB_UNUSED,
va_list ap HB_UNUSED) {}
-template <int max_level> inline void
+template <int max_level> static inline void
_hb_debug_msg (const char *what,
const void *obj,
const char *func,
@@ -617,7 +617,7 @@
int level_dir,
const char *message,
...) HB_PRINTF_FUNC(7, 8);
-template <int max_level> inline void
+template <int max_level> static inline void
_hb_debug_msg (const char *what,
const void *obj,
const char *func,
