diff --git a/src/backend/utils/mb/encnames.c b/src/backend/utils/mb/encnames.c
index 7a3715750b0..9a05e573ffa 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 e46bcf0006e..2fc17feb5eb 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