diff --git a/parse.c b/parse.c
index 7803020..cd54e07 100644
--- a/parse.c
+++ b/parse.c
@@ -528,6 +528,7 @@ static Type *declspec(Token **rest, Token *tok, VarAttr *attr) {
       ty = ty_float;
       break;
     case DOUBLE:
+    case LONG + DOUBLE:
       ty = ty_double;
       break;
     default:
diff --git a/test/sizeof.c b/test/sizeof.c
index 1ec50f4..29ea18d 100644
--- a/test/sizeof.c
+++ b/test/sizeof.c
@@ -96,6 +96,8 @@ int main() {
   ASSERT(4, sizeof(1f/2));
   ASSERT(8, sizeof(1.0/2));
 
+  ASSERT(8, sizeof(long double));
+
   printf("OK\n");
   return 0;
 }