diff --git a/cpp/diff_match_patch.cpp b/cpp/diff_match_patch.cpp
index 64f270c..2dc0f10 100644
--- a/cpp/diff_match_patch.cpp
+++ b/cpp/diff_match_patch.cpp
@@ -1383,7 +1383,7 @@ QList<Diff> diff_match_patch::diff_fromDelta(const QString &text1,
     // Each token begins with a one character parameter which specifies the
     // operation of this token (delete, insert, equality).
     QString param = safeMid(token, 1);
-    switch (token[0].toAscii()) {
+    switch (token[0].toLatin1()) {
       case '+':
         param = QUrl::fromPercentEncoding(qPrintable(param));
         diffs.append(Diff(INSERT, param));
@@ -2074,7 +2074,7 @@ QList<Patch> diff_match_patch::patch_fromText(const QString &textline) {
         text.removeFirst();
         continue;
       }
-      sign = text.front()[0].toAscii();
+      sign = text.front()[0].toLatin1();
       line = safeMid(text.front(), 1);
       line = line.replace("+", "%2B");  // decode would change all "+" to " "
       line = QUrl::fromPercentEncoding(qPrintable(line));
diff --git a/cpp/diff_match_patch_test.cpp b/cpp/diff_match_patch_test.cpp
index f75b1cd..1e4a75d 100644
--- a/cpp/diff_match_patch_test.cpp
+++ b/cpp/diff_match_patch_test.cpp
@@ -16,7 +16,7 @@
  * limitations under the License.
  */
 
-// Code known to compile and run with Qt 4.3 through Qt 4.7.
+// Code known to compile and run with Qt 5
 #include <QtCore>
 #include "diff_match_patch.h"
 #include "diff_match_patch_test.h"
@@ -1055,7 +1055,7 @@ void diff_match_patch_test::assertEquals(const QString &strCase, const QMap<QCha
     i2.next();
     if (i1.key() != i2.key() || i1.value() != i2.value()) {
       qDebug("%s FAIL\nExpected: (%c, %d)\nActual: (%c, %d)", qPrintable(strCase),
-          i1.key().toAscii(), i1.value(), i2.key().toAscii(), i2.value());
+          i1.key().toLatin1(), i1.value(), i2.key().toLatin1(), i2.value());
       throw strCase;
     }
   }
@@ -1063,13 +1063,13 @@ void diff_match_patch_test::assertEquals(const QString &strCase, const QMap<QCha
   if (i1.hasNext()) {
     i1.next();
     qDebug("%s FAIL\nExpected: (%c, %d)\nActual: none",
-        qPrintable(strCase), i1.key().toAscii(), i1.value());
+        qPrintable(strCase), i1.key().toLatin1(), i1.value());
     throw strCase;
   }
   if (i2.hasNext()) {
     i2.next();
     qDebug("%s FAIL\nExpected: none\nActual: (%c, %d)",
-        qPrintable(strCase), i2.key().toAscii(), i2.value());
+        qPrintable(strCase), i2.key().toLatin1(), i2.value());
     throw strCase;
   }
   qDebug("%s OK", qPrintable(strCase));