diff --git a/unix/Makefile b/unix/Makefile
index ab68760546..e7e0d354b0 100644
--- a/unix/Makefile
+++ b/unix/Makefile
@@ -133,4 +133,4 @@ uninstall:
 # build synthetically fast interpreter for benchmarking
 fast:
 	@echo Make sure to run make -B
-	$(MAKE) COPT="-O2 -DNDEBUG" CFLAGS_EXTRA='-DMP_CONFIGFILE="<mpconfigport_fast.h>"' BUILD=build-fast
+	$(MAKE) COPT="-O2 -DNDEBUG -fno-crossjumping" CFLAGS_EXTRA='-DMP_CONFIGFILE="<mpconfigport_fast.h>"' BUILD=build-fast