diff --git a/lib/config-win32.h b/lib/config-win32.h
index 95f1595bec..744e02271c 100644
--- a/lib/config-win32.h
+++ b/lib/config-win32.h
@@ -558,7 +558,8 @@
 #    if defined(_USING_V110_SDK71_)
 #      error VS2012 does not support Windows build targets prior to Windows XP
 #    else
-#      error VS2012 does not support Windows build targets prior to Windows Vista
+#      error VS2012 does not support Windows build targets prior to Windows \
+Vista
 #    endif
 #  endif
 #endif