diff --git a/src/vim9compile.c b/src/vim9compile.c
index 4007641..0d19b7d 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -3027,6 +3027,8 @@
 
     if (d == NULL)
 	return FAIL;
+    if (generate_ppconst(cctx, ppconst) == FAIL)
+	return FAIL;
     for (;;)
     {
 	char_u	    *key = NULL;