diff --git a/src/common/string.cpp b/src/common/string.cpp
index 6c11296622..dcc878a2b9 100644
--- a/src/common/string.cpp
+++ b/src/common/string.cpp
@@ -1494,7 +1494,7 @@ ToNumeric(T* pVal,
     PreserveErrno preserveErrno;
     errno = 0;
 
-    wxStringCharType *end;
+    wxStringCharType *end = nullptr;
 
     const R res = convert(start, &end, base);
     if ( rangeCheck && !rangeCheck(res) )