diff --git a/src/initializer.cpp b/src/initializer.cpp
index e03213c31..dd99b4ce4 100644
--- a/src/initializer.cpp
+++ b/src/initializer.cpp
@@ -40,7 +40,7 @@ int main(int argc, char **argv) {
   bool asQS{false};
   app.add_flag("-q, --qs", asQS, "Save output as .qs")->default_val(false);
 
-  bool includeH0O0;
+  bool includeH0O0{false};
   app.add_flag("--include-h0-o0", includeH0O0,
                "Include H(0) and O(0) in the output")
       ->default_val(false);