diff --git a/src/scanner.c b/src/scanner.c
index 0c3430a..6413cf3 100644
--- a/src/scanner.c
+++ b/src/scanner.c
@@ -1184,7 +1184,7 @@ static bool scan(Scanner *scanner, TSLexer *lexer, const bool *valid_symbols) {
     return false;
 }
 
-void *tree_sitter_bash_external_scanner_create() {
+void *tree_sitter_bash_external_scanner_create(void) {
     Scanner *scanner = calloc(1, sizeof(Scanner));
     array_init(&scanner->heredocs);
     return scanner;