diff --git a/src/codegen.cpp b/src/codegen.cpp
index 2264b08191fc409de559717f5a3ba1b291864f06..a69f9e30b84c1c44f2563532d7685f970956029e 100644
--- a/src/codegen.cpp
+++ b/src/codegen.cpp
@@ -542,8 +542,11 @@ static LLVMValueRef gen_arithmetic_bin_op(CodeGen *g, AstNode *source_node,
             return LLVMBuildShl(g->builder, val1, val2, "");
         case BinOpTypeBitShiftRight:
         case BinOpTypeAssignBitShiftRight:
+            assert(op1_type->id == TypeTableEntryIdInt);
+            assert(op2_type->id == TypeTableEntryIdInt);
+
             add_debug_source_node(g, source_node);
-            if (op1_type->id == TypeTableEntryIdInt) {
+            if (op1_type->data.integral.is_signed) {
                 return LLVMBuildAShr(g->builder, val1, val2, "");
             } else {
                 return LLVMBuildLShr(g->builder, val1, val2, "");