diff --git a/jscompile.c b/jscompile.c
index d6aa084..325d1b2 100644
--- a/jscompile.c
+++ b/jscompile.c
@@ -538,7 +538,7 @@ static void ccall(JF, js_Ast *fun, js_Ast *args)
 			ceval(J, F, fun, args);
 			return;
 		}
-		/* fall through */
+		/* fallthrough */
 	default:
 		cexp(J, F, fun);
 		emit(J, F, OP_UNDEF);
diff --git a/jsstring.c b/jsstring.c
index 33d3bf4..9ac46ef 100644
--- a/jsstring.c
+++ b/jsstring.c
@@ -426,7 +426,8 @@ loop:
 		while (*r) {
 			if (*r == '$') {
 				switch (*(++r)) {
-				case 0: --r; /* end of string; back up and fall through */
+				case 0: --r; /* end of string; back up */
+				/* fallthrough */
 				case '$': js_putc(J, &sb, '$'); break;
 				case '`': js_putm(J, &sb, source, s); break;
 				case '\'': js_puts(J, &sb, s + n); break;
@@ -522,7 +523,8 @@ static void Sp_replace_string(js_State *J)
 		while (*r) {
 			if (*r == '$') {
 				switch (*(++r)) {
-				case 0: --r; /* end of string; back up and fall through */
+				case 0: --r; /* end of string; back up */
+				/* fallthrough */
 				case '$': js_putc(J, &sb, '$'); break;
 				case '&': js_putm(J, &sb, s, s + n); break;
 				case '`': js_putm(J, &sb, source, s); break;
diff --git a/regexp.c b/regexp.c
index a4399fe..13e381b 100644
--- a/regexp.c
+++ b/regexp.c
@@ -110,7 +110,7 @@ static int nextrune(struct cstate *g)
 	if (g->yychar == '\\') {
 		g->source += chartorune(&g->yychar, g->source);
 		switch (g->yychar) {
-		case 0: die(g, "unterminated escape sequence");
+		case 0: die(g, "unterminated escape sequence"); break;
 		case 'f': g->yychar = '\f'; return 0;
 		case 'n': g->yychar = '\n'; return 0;
 		case 'r': g->yychar = '\r'; return 0;