diff --git a/include/share/alloc.h b/include/share/alloc.h
index b0da6941..248ad102 100644
--- a/include/share/alloc.h
+++ b/include/share/alloc.h
@@ -66,7 +66,7 @@
 #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
 extern int alloc_check_threshold, alloc_check_counter;
 
-static inline int alloc_check() {
+static inline int alloc_check(void) {
 	if(alloc_check_threshold == INT32_MAX)
 		return 0;
 	else if(alloc_check_counter++ == alloc_check_threshold)
diff --git a/src/metaflac/operations.c b/src/metaflac/operations.c
index 65fc6dbd..a14a290a 100644
--- a/src/metaflac/operations.c
+++ b/src/metaflac/operations.c
@@ -758,7 +758,7 @@ void write_metadata(const char *filename, FLAC__StreamMetadata *block, unsigned
 								flac_printf("%c",block->data.application.data[i]);
 							else {
 								char replacement[4] = {0xef, 0xbf, 0xbd, 0}; /* Unicode replacement character */
-								flac_printf(replacement);
+								flac_printf("%s",replacement);
 							}
 						}
 			}