diff --git a/build/Android.common.mk b/build/Android.common.mk
index 5341136..b63d2dc 100644
--- a/build/Android.common.mk
+++ b/build/Android.common.mk
@@ -103,7 +103,7 @@
 
 ifeq ($(ART_USE_OPTIMIZING_COMPILER),true)
 DEX2OAT_FLAGS := --compiler-backend=Optimizing
-DALVIKVM_FLAGS := -Xcompiler-option --compiler-backend=Optimizing
+DALVIKVM_FLAGS += -Xcompiler-option --compiler-backend=Optimizing
 endif
 
 #