diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -131,8 +131,7 @@
 	-Wcast-align
 	-Wunused-parameter
 	-Wmissing-braces
-	# FIXME: Activating this flag cause cmake to fail on leveldb.
-	# -Wthread-safety-analysis
+	-Wthread-safety-analysis
 	-Wshadow
 	-Wrange-loop-analysis
 )