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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 834b15cbdf76..ce38e2ab9213 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -87,7 +87,7 @@ static Expr substArgs(EvalState & state,
            arguments.  Find out which. */
         for (ATermIterator i(formals); i; ++i) {
             Expr name; ATerm d1, d2;
-            matchFormal(*i, name, d1, d2);
+            if (!matchFormal(*i, name, d1, d2)) abort();
             subs.remove(name);
         }
         throw TypeError(format("the function does not expect an argument named `%1%'")