diff --git a/libs/ui/Android.mk b/libs/ui/Android.mk
index 348dd6882c426..9577044f35e60 100644
--- a/libs/ui/Android.mk
+++ b/libs/ui/Android.mk
@@ -40,4 +40,8 @@ LOCAL_SHARED_LIBRARIES := \
 
 LOCAL_MODULE:= libui
 
+ifeq ($(TARGET_SIMULATOR),true)
+    LOCAL_LDLIBS += -lpthread
+endif
+
 include $(BUILD_SHARED_LIBRARY)