diff --git a/core/java.mk b/core/java.mk
index 5e9a285..b80e8b8 100644
--- a/core/java.mk
+++ b/core/java.mk
@@ -471,7 +471,7 @@
     -verbose \
     $(legacy_proguard_flags)
 # not supported with jack
-ifeq ($(strip $(LOCAL_USE_JACK)),true)
+ifeq ($(LOCAL_USE_JACK),true)
     $(error $(LOCAL_MODULE): Build with jack of instrumentation when obfuscating is not yet supported)
 endif
 
@@ -562,7 +562,7 @@
 
 endif  # full_classes_jar is defined
 
-ifeq ($(strip $(LOCAL_USE_JACK)),true)
+ifeq ($(LOCAL_USE_JACK),true)
 $(LOCAL_INTERMEDIATE_TARGETS): \
 	PRIVATE_JACK_INTERMEDIATES_DIR := $(intermediates.COMMON)/jack