diff --git a/src/Makefile b/src/Makefile
index 9f7d28ce..40cd1015 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -238,8 +238,8 @@ else
 ifneq (,$(findstring LJ_TARGET_ARM ,$(TARGET_TESTARCH)))
   TARGET_LJARCH= arm
 else
-ifneq (,$(findstring LJ_TARGET_S390 ,$(TARGET_TESTARCH)))
-  TARGET_LJARCH= s390
+ifneq (,$(findstring LJ_TARGET_S390x ,$(TARGET_TESTARCH)))
+  TARGET_LJARCH= s390x
 else
 ifneq (,$(findstring LJ_TARGET_ARM64 ,$(TARGET_TESTARCH)))
   TARGET_LJARCH= arm64