diff --git a/source/blender/editors/gpencil/gpencil_utils.c b/source/blender/editors/gpencil/gpencil_utils.c
index f91480b72e7..c0024052d82 100644
--- a/source/blender/editors/gpencil/gpencil_utils.c
+++ b/source/blender/editors/gpencil/gpencil_utils.c
@@ -3356,7 +3356,7 @@ void ED_gpencil_layer_merge(bGPdata *gpd,
   }
 }
 
-void gpencil_layer_new_name_get(bGPdata *gpd, char *rname)
+static void gpencil_layer_new_name_get(bGPdata *gpd, char *rname)
 {
   int index = 0;
   LISTBASE_FOREACH (bGPDlayer *, gpl, &gpd->layers) {