diff --git a/src/plugins/platforms/windows/qwindowsglcontext.cpp b/src/plugins/platforms/windows/qwindowsglcontext.cpp
index b93ead61c9..dcc3725708 100644
--- a/src/plugins/platforms/windows/qwindowsglcontext.cpp
+++ b/src/plugins/platforms/windows/qwindowsglcontext.cpp
@@ -807,8 +807,8 @@ QOpenGLStaticContext::QOpenGLStaticContext() :
     wglSwapInternalExt((WglSwapInternalExt)wglGetProcAddress("wglSwapIntervalEXT")),
     wglGetSwapInternalExt((WglGetSwapInternalExt)wglGetProcAddress("wglGetSwapIntervalEXT"))
 {
-    if (extensionNames.startsWith(SAMPLE_BUFFER_EXTENSION" ")
-            || extensionNames.indexOf(" "SAMPLE_BUFFER_EXTENSION" ") != -1)
+    if (extensionNames.startsWith(SAMPLE_BUFFER_EXTENSION " ")
+            || extensionNames.indexOf(" " SAMPLE_BUFFER_EXTENSION " ") != -1)
         extensions |= SampleBuffers;
 }