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-rw-r--r--src/libexpr/eval.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index 90edbecb50cd..e49dc0a3b966 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -521,7 +521,7 @@ Expr evalExpr2(EvalState & state, Expr e)
 
     /* Backwards compatability: subpath operator (~). */
     if (matchSubPath(e, e1, e2)) {
-        static bool haveWarned;
+        static bool haveWarned = false;
         warnOnce(haveWarned, "the subpath operator (~) is deprecated, use string concatenation (+) instead");
         ATermList context = ATempty;
         bool dummy;