diff --git a/src/config.h.in b/src/config.h.in
index a5b3172d..01d541a2 100644
--- a/src/config.h.in
+++ b/src/config.h.in
@@ -43,28 +43,28 @@
 #cmakedefine _GLFW_COCOA_NSGL
 
 // Define this to 1 if building as a shared library / dynamic library / DLL
-#cmakedefine _GLFW_BUILD_DLL       1
+#cmakedefine _GLFW_BUILD_DLL
 
 // Define this to 1 to disable dynamic loading of winmm
-#cmakedefine _GLFW_NO_DLOAD_WINMM  1
+#cmakedefine _GLFW_NO_DLOAD_WINMM
 
 // Define this to 1 if XRandR is available
-#cmakedefine _GLFW_HAS_XRANDR      1
+#cmakedefine _GLFW_HAS_XRANDR
 // Define this to 1 if Xf86VidMode is available
-#cmakedefine _GLFW_HAS_XF86VIDMODE 1
+#cmakedefine _GLFW_HAS_XF86VIDMODE
 
 // Define this to 1 if Xkb is available
-#cmakedefine _GLFW_HAS_XKB         1
+#cmakedefine _GLFW_HAS_XKB
 
 // Define this to 1 if glXGetProcAddress is available
-#cmakedefine _GLFW_HAS_GLXGETPROCADDRESS    1
+#cmakedefine _GLFW_HAS_GLXGETPROCADDRESS
 // Define this to 1 if glXGetProcAddressARB is available
-#cmakedefine _GLFW_HAS_GLXGETPROCADDRESSARB 1
+#cmakedefine _GLFW_HAS_GLXGETPROCADDRESSARB
 // Define this to 1 if glXGetProcAddressEXT is available
-#cmakedefine _GLFW_HAS_GLXGETPROCADDRESSEXT 1
+#cmakedefine _GLFW_HAS_GLXGETPROCADDRESSEXT
 
 // Define this to 1 if the Linux joystick API is available
-#cmakedefine _GLFW_USE_LINUX_JOYSTICKS 1
+#cmakedefine _GLFW_USE_LINUX_JOYSTICKS
 
 // The GLFW version as used by glfwGetVersionString
 #define _GLFW_VERSION_FULL "@GLFW_VERSION_FULL@"