diff --git a/src/hb.hh b/src/hb.hh
index ffbfef099..187dbbdb7 100644
--- a/src/hb.hh
+++ b/src/hb.hh
@@ -89,6 +89,7 @@
 #pragma GCC diagnostic error   "-Wstring-conversion"
 #pragma GCC diagnostic error   "-Wswitch-enum"
 #pragma GCC diagnostic error   "-Wtautological-overlap-compare"
+#pragma GCC diagnostic error   "-Wuninitialized"
 #pragma GCC diagnostic error   "-Wunneeded-internal-declaration"
 #pragma GCC diagnostic error   "-Wunused"
 #pragma GCC diagnostic error   "-Wunused-local-typedefs"