diff --git a/src/plugins/platforms/linuxfb/qlinuxfbscreen.cpp b/src/plugins/platforms/linuxfb/qlinuxfbscreen.cpp
index 1dac60a7457..4d170f15f2e 100644
--- a/src/plugins/platforms/linuxfb/qlinuxfbscreen.cpp
+++ b/src/plugins/platforms/linuxfb/qlinuxfbscreen.cpp
@@ -264,7 +264,7 @@ static int openTtyDevice(const QString &device)
 
 static bool switchToGraphicsMode(int ttyfd, int *oldMode)
 {
-    ioctl(ttyfd, KDGETMODE, &oldMode);
+    ioctl(ttyfd, KDGETMODE, oldMode);
     if (*oldMode != KD_GRAPHICS) {
        if (ioctl(ttyfd, KDSETMODE, KD_GRAPHICS) != 0)
             return false;