--- src/corelib/io/qprocess_unix.cpp
+++ src/corelib/io/qprocess_unix.cpp
@@ -839,10 +839,14 @@ bool QProcessPrivate::processStarted()
 
 qint64 QProcessPrivate::bytesAvailableFromStdout() const
 {
-    size_t nbytes = 0;
+#if defined (Q_OS_IRIX)
+    off_t nbytes = 0;
+#else
+    int nbytes = 0;
+#endif
     qint64 available = 0;
     if (::ioctl(stdoutChannel.pipe[0], FIONREAD, (char *) &nbytes) >= 0)
-        available = (qint64) *((int *) &nbytes);
+        available = (qint64) nbytes;
 #if defined (QPROCESS_DEBUG)
     qDebug("QProcessPrivate::bytesAvailableFromStdout() == %lld", available);
 #endif
--- src/network/socket/qnativesocketengine_unix.cpp
+++ src/network/socket/qnativesocketengine_unix.cpp
@@ -515,18 +515,18 @@ qint64 QNativeSocketEnginePrivate::nativ
       ioctl() to be an int, which is normally 32-bit even on 64-bit
       machines.
 
-      IRIX, on the other hand, expects a size_t, which is 64-bit on
+      IRIX, on the other hand, expects a off_t, which is 64-bit on
       64-bit machines.
-
-      So, the solution is to use size_t initialized to zero to make
-      sure all bits are set to zero, preventing underflow with the
-      FreeBSD/Linux/Solaris ioctls.
     */
-    size_t nbytes = 0;
+#if defined (Q_OS_IRIX)
+    off_t nbytes = 0;
+#else
+    int nbytes = 0;
+#endif
     // gives shorter than true amounts on Unix domain sockets.
     qint64 available = 0;
     if (::ioctl(socketDescriptor, FIONREAD, (char *) &nbytes) >= 0)
-        available = (qint64) *((int *) &nbytes);
+        available = (qint64) nbytes;
 
 #if defined (QNATIVESOCKETENGINE_DEBUG)
     qDebug("QNativeSocketEnginePrivate::nativeBytesAvailable() == %lli", available);