diff --git a/test/testutils.cpp b/test/testutils.cpp
index ecf81051ec2..a70324fb7a5 100644
--- a/test/testutils.cpp
+++ b/test/testutils.cpp
@@ -429,7 +429,7 @@ class TestUtils : public TestFixture {
         }
     }
 
-    void replaceEscapeSequences() {
+    void replaceEscapeSequences() const {
         ASSERT_EQUALS("\x30", ::replaceEscapeSequences("\\x30"));
         ASSERT_EQUALS("\030", ::replaceEscapeSequences("\\030"));
         ASSERT_EQUALS("\r", ::replaceEscapeSequences("\\r"));