diff --git a/src/backend/utils/mb/encnames.c b/src/backend/utils/mb/encnames.c
index 7a3715750b0c7bd75992f37129a3fc025f060693..9a05e573ffac7077a319efd6335fe45f1e4beb3b 100644
--- a/src/backend/utils/mb/encnames.c
+++ b/src/backend/utils/mb/encnames.c
@@ -6,7 +6,6 @@
  */
 #ifdef FRONTEND
 #include "postgres_fe.h"
-#define Assert(condition)
 #else
 #include "postgres.h"
 #include "utils/builtins.h"
diff --git a/src/backend/utils/mb/wchar.c b/src/backend/utils/mb/wchar.c
index e46bcf0006e2a382ef838e95f314d4218c223bb4..2fc17feb5ebce3ff539cdaef20a89aa0b213d3ef 100644
--- a/src/backend/utils/mb/wchar.c
+++ b/src/backend/utils/mb/wchar.c
@@ -7,7 +7,6 @@
 /* can be used in either frontend or backend */
 #ifdef FRONTEND
 #include "postgres_fe.h"
-#define Assert(condition)
 #else
 #include "postgres.h"
 #endif