diff --git a/tools/versioner/src/versioner.h b/tools/versioner/src/versioner.h
index 97b1509..a5f2c7d 100644
--- a/tools/versioner/src/versioner.h
+++ b/tools/versioner/src/versioner.h
@@ -22,6 +22,7 @@
 #include <unordered_map>
 #include <unordered_set>
 
+extern bool strict;
 extern bool verbose;
 extern bool add_include;