diff --git a/src/plugins/cppeditor/cppquickfixes.cpp b/src/plugins/cppeditor/cppquickfixes.cpp
index 5e44f7be22e..f1d86076261 100644
--- a/src/plugins/cppeditor/cppquickfixes.cpp
+++ b/src/plugins/cppeditor/cppquickfixes.cpp
@@ -68,6 +68,8 @@
 #include <QtGui/QTextBlock>
 #include <QtGui/QTextCursor>
 
+#include <cctype>
+
 using namespace CppEditor;
 using namespace CppEditor::Internal;
 using namespace CppTools;
@@ -1283,7 +1285,7 @@ public:
         // remove trailing L or U and stuff
         const char * const spell = numeric->chars();
         int numberLength = numeric->size();
-        while (numberLength > 0 && !isHexadecimal(spell[numberLength - 1]))
+        while (numberLength > 0 && !std::isxdigit(spell[numberLength - 1]))
             --numberLength;
         if (numberLength < 1)
             return result;
diff --git a/src/plugins/cpptools/cpptoolsreuse.cpp b/src/plugins/cpptools/cpptoolsreuse.cpp
index 0d0288a228c..ed97b677392 100644
--- a/src/plugins/cpptools/cpptoolsreuse.cpp
+++ b/src/plugins/cpptools/cpptoolsreuse.cpp
@@ -35,8 +35,6 @@
 #include <QtGui/QTextDocument>
 #include <QtGui/QTextCursor>
 
-#include <cctype>
-
 namespace CppTools {
 
 void moveCursorToEndOfIdentifier(QTextCursor *tc) {
@@ -51,11 +49,4 @@ void moveCursorToEndOfIdentifier(QTextCursor *tc) {
     }
 }
 
-bool isHexadecimal(char c)
-{
-    return std::isdigit(c)
-            || (c >= 'a' && c <= 'f')
-            || (c >= 'A' && c <= 'F');
-}
-
 } // CppTools
diff --git a/src/plugins/cpptools/cpptoolsreuse.h b/src/plugins/cpptools/cpptoolsreuse.h
index 115f1d41053..3be58382fdb 100644
--- a/src/plugins/cpptools/cpptoolsreuse.h
+++ b/src/plugins/cpptools/cpptoolsreuse.h
@@ -8,7 +8,6 @@ QT_FORWARD_DECLARE_CLASS(QTextCursor)
 namespace CppTools {
 
 void CPPTOOLS_EXPORT moveCursorToEndOfIdentifier(QTextCursor *tc);
-bool CPPTOOLS_EXPORT isHexadecimal(char c);
 
 } // CppTools