diff --git a/compiler-rt/lib/tsan/rtl/CMakeLists.txt b/compiler-rt/lib/tsan/rtl/CMakeLists.txt
--- a/compiler-rt/lib/tsan/rtl/CMakeLists.txt
+++ b/compiler-rt/lib/tsan/rtl/CMakeLists.txt
@@ -271,6 +271,7 @@
               $<TARGET_OBJECTS:RTUbsan.${arch}>
       ADDITIONAL_HEADERS ${TSAN_HEADERS}
       CFLAGS ${TSAN_RTL_DYNAMIC_CFLAGS}
+      DEFS SANITIZER_SHARED
       LINK_LIBS ${TSAN_DYNAMIC_LINK_LIBS}
       LINK_FLAGS ${SANITIZER_COMMON_LINK_FLAGS}
       PARENT_TARGET tsan)
diff --git a/compiler-rt/lib/tsan/rtl/tsan_rtl.h b/compiler-rt/lib/tsan/rtl/tsan_rtl.h
--- a/compiler-rt/lib/tsan/rtl/tsan_rtl.h
+++ b/compiler-rt/lib/tsan/rtl/tsan_rtl.h
@@ -681,7 +681,7 @@
   // If we can use .preinit_array, assume that __tsan_init
   // called from .preinit_array initializes runtime before
   // any instrumented code except ANDROID.
-#if (!SANITIZER_CAN_USE_PREINIT_ARRAY || defined(__ANDROID__))
+#if (!SANITIZER_CAN_USE_PREINIT_ARRAY || defined(SANITIZER_SHARED))
   if (UNLIKELY(!is_initialized))
     Initialize(thr);
 #endif