diff --git a/Source/cmSystemTools.cxx b/Source/cmSystemTools.cxx
index baac7b878..9852dd6f1 100644
--- a/Source/cmSystemTools.cxx
+++ b/Source/cmSystemTools.cxx
@@ -2923,3 +2923,11 @@ std::vector<std::string> cmSystemTools::tokenize(const std::string& str,
     }
   return tokens;
 }
+
+//----------------------------------------------------------------------------
+bool cmSystemTools::StringToInt(const char* str, int* value)
+{
+  char *endp;
+  *value = static_cast<int>(strtol(str, &endp, 10));
+  return (*endp == '\0') && (endp != str);
+}
diff --git a/Source/cmSystemTools.h b/Source/cmSystemTools.h
index 4455dd1d8..763389b5f 100644
--- a/Source/cmSystemTools.h
+++ b/Source/cmSystemTools.h
@@ -458,6 +458,9 @@ public:
   static std::vector<std::string> tokenize(const std::string& str,
                                            const std::string& sep);
 
+  /** Convert string to int. Expected that the whole string is an integer */
+  static bool StringToInt(const char* str, int* value);
+
 #ifdef _WIN32
   struct WindowsFileRetry
   {