diff --git a/src/parser.cpp b/src/parser.cpp
index 275fa90167..3a3e13f1d8 100644
--- a/src/parser.cpp
+++ b/src/parser.cpp
@@ -690,7 +690,7 @@ static AstNode *ast_parse_top_level_decl(ParseContext *pc, VisibMod visib_mod, B
             AstNode *res = fn_proto;
             if (body != nullptr) {
                 if (fn_proto->data.fn_proto.is_extern) {
-                    ast_error(pc, first, "Extern functions have no body");
+                    ast_error(pc, first, "extern functions have no body");
                 }
                 res = ast_create_node_copy_line_info(pc, NodeTypeFnDef, fn_proto);
                 res->data.fn_def.fn_proto = fn_proto;
diff --git a/test/compile_errors.zig b/test/compile_errors.zig
index c5f5b6f9da..9f2b3716b0 100644
--- a/test/compile_errors.zig
+++ b/test/compile_errors.zig
@@ -17,7 +17,7 @@ pub fn addCases(cases: *tests.CompileErrorContext) void {
         \\    return a + b;
         \\}
     , &[_][]const u8{
-        "tmp.zig:1:1: error: Extern functions have no body",
+        "tmp.zig:1:1: error: extern functions have no body",
     });
 
     cases.addTest("duplicate field in anonymous struct literal",