diff --git a/src/vim9compile.c b/src/vim9compile.c
index c0e4674..941309f 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -3113,6 +3113,8 @@
     // Compile it into instructions.
     compile_def_function(ufunc, TRUE, cctx);
 
+    clear_evalarg(&evalarg, NULL);
+
     if (ufunc->uf_def_status == UF_COMPILED)
 	return generate_FUNCREF(cctx, ufunc->uf_dfunc_idx);
     return FAIL;