4 files changed, 5 insertions, 5 deletions
diff --git a/src/corelib/io/qtemporarydir.cpp b/src/corelib/io/qtemporarydir.cpp
index f8cd2e780e..579d569a01 100644
--- a/src/corelib/io/qtemporarydir.cpp
+++ b/src/corelib/io/qtemporarydir.cpp
@@ -99,11 +99,11 @@ static char *mkdtemp(char *templateName)
 {
     static const char letters[] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
 
-    const int length = strlen(templateName);
+    const size_t length = strlen(templateName);
 
     char *XXXXXX = templateName + length - 6;
 
-    if ((length < 6) || strncmp(XXXXXX, "XXXXXX", 6))
+    if ((length < 6u) || strncmp(XXXXXX, "XXXXXX", 6))
         return 0;
 
     for (int i = 0; i < 256; ++i) {
diff --git a/src/corelib/json/qjsonparser.cpp b/src/corelib/json/qjsonparser.cpp
index 6de3db8af8..9b11c9ac3e 100644
--- a/src/corelib/json/qjsonparser.cpp
+++ b/src/corelib/json/qjsonparser.cpp
@@ -821,7 +821,7 @@ bool Parser::parseString(bool *latin1)
     // no unicode string, we are done
     if (*latin1) {
         // write string length
-        *(QJsonPrivate::qle_ushort *)(data + stringPos) = current - outStart - sizeof(ushort);
+        *(QJsonPrivate::qle_ushort *)(data + stringPos) = ushort(current - outStart - sizeof(ushort));
         int pos = reserveSpace((4 - current) & 3);
         while (pos & 3)
             data[pos++] = 0;
diff --git a/src/corelib/kernel/qcoreapplication_win.cpp b/src/corelib/kernel/qcoreapplication_win.cpp
index c1f7c8ab25..7cc1f0e286 100644
--- a/src/corelib/kernel/qcoreapplication_win.cpp
+++ b/src/corelib/kernel/qcoreapplication_win.cpp
@@ -109,7 +109,7 @@ Q_CORE_EXPORT QString qAppFileName()                // get application file name
         size = MAX_PATH * i;
         b = reinterpret_cast<wchar_t *>(realloc(b, (size + 1) * sizeof(wchar_t)));
         if (b)
-            v = GetModuleFileName(NULL, b, size);
+            v = GetModuleFileName(NULL, b, DWORD(size));
     } while (b && v == size);
 
     if (b)
diff --git a/src/corelib/mimetypes/qmimemagicrule.cpp b/src/corelib/mimetypes/qmimemagicrule.cpp
index 1dee62f6d0..8421516b5c 100644
--- a/src/corelib/mimetypes/qmimemagicrule.cpp
+++ b/src/corelib/mimetypes/qmimemagicrule.cpp
@@ -267,7 +267,7 @@ QMimeMagicRule::QMimeMagicRule(QMimeMagicRule::Type theType,
             d->mask = QByteArray::fromHex(QByteArray::fromRawData(d->mask.constData() + 2, d->mask.size() - 2));
             Q_ASSERT(d->mask.size() == d->pattern.size());
         } else {
-            d->mask.fill(static_cast<char>(0xff), d->pattern.size());
+            d->mask.fill(char(-1), d->pattern.size());
         }
         d->mask.squeeze();
         d->matchFunction = matchString;