diff --git a/src/devices/nm-acd-manager.c b/src/devices/nm-acd-manager.c
index cacc37ca65..d7d12e6421 100644
--- a/src/devices/nm-acd-manager.c
+++ b/src/devices/nm-acd-manager.c
@@ -95,7 +95,7 @@ _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;