diff --git a/src/aro/Parser.zig b/src/aro/Parser.zig
index c20a273c..0836ca86 100644
--- a/src/aro/Parser.zig
+++ b/src/aro/Parser.zig
@@ -1152,8 +1152,10 @@ fn decl(p: *Parser) Error!bool {
 
         const interned_name = try StrInt.intern(p.comp, p.tokSlice(init_d.d.name));
         if (decl_spec.storage_class == .typedef) {
-            try p.syms.defineTypedef(p, interned_name, init_d.d.ty, init_d.d.name, node);
-            p.typedefDefined(interned_name, init_d.d.ty);
+            if (!init_d.d.ty.is(.invalid)) {
+                try p.syms.defineTypedef(p, interned_name, init_d.d.ty, init_d.d.name, node);
+                p.typedefDefined(interned_name, init_d.d.ty);
+            }
         } else if (init_d.initializer.node != .none or
             (p.func.ty != null and decl_spec.storage_class != .@"extern"))
         {
diff --git a/src/aro/SymbolStack.zig b/src/aro/SymbolStack.zig
index dba72234..a8e06407 100644
--- a/src/aro/SymbolStack.zig
+++ b/src/aro/SymbolStack.zig
@@ -175,6 +175,7 @@ pub fn defineTypedef(
     tok: TokenIndex,
     node: NodeIndex,
 ) !void {
+    assert(!ty.is(.invalid));
     if (s.get(name, .vars)) |prev| {
         switch (prev.kind) {
             .typedef => {
diff --git a/test/cases/redefine invalid typedef.c b/test/cases/redefine invalid typedef.c
new file mode 100644
index 00000000..e4138760
--- /dev/null
+++ b/test/cases/redefine invalid typedef.c	
@@ -0,0 +1,5 @@
+typedef float *invalid1 __attribute__((vector_size(8)));
+typedef float invalid1;
+
+#define EXPECTED_ERRORS "redefine invalid typedef.c:1:40: error: invalid vector element type 'float *'" \
+