diff --git a/src/devices/nm-acd-manager.c b/src/devices/nm-acd-manager.c
index d9caadc6b6..1c6c42a0ea 100644
--- a/src/devices/nm-acd-manager.c
+++ b/src/devices/nm-acd-manager.c
@@ -84,7 +84,7 @@ _acd_event_to_string (unsigned int event)
 #define ACD_EVENT_TO_STRING_BUF_SIZE 50
 
 static const char *
-_acd_event_to_string_buf (unsigned event, char buffer[ACD_EVENT_TO_STRING_BUF_SIZE])
+_acd_event_to_string_buf (unsigned event, char buffer[static ACD_EVENT_TO_STRING_BUF_SIZE])
 {
 	const char *s;