diff --git a/configure b/configure
index 696e4867d..433451d65 100755
--- a/configure
+++ b/configure
@@ -174,7 +174,7 @@ set_defaults()
 	fi
     fi
     if [ "$FUZZING" != 0 ]; then
-	FUZZFLAGS="-fsanitize=fuzzer-no-link"
+	FUZZFLAGS="-fsanitize=fuzzer-no-link -DFUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION"
 	CSANFLAGS="$CSANFLAGS $FUZZFLAGS"
     fi
     echo CSANFLAGS = $CSANFLAGS