diff --git a/snippets/defines.hpp b/snippets/defines.hpp
index 276272d..b680d1e 100644
--- a/snippets/defines.hpp
+++ b/snippets/defines.hpp
@@ -14,6 +14,17 @@
 #  undef MemoryBarrier
 #endif
 
+// XLib.h defines True/False, which collides with our vk::True/vk::False
+// ->  undef them and provide some namepace-secure constexpr
+#if defined( True )
+#  undef True
+constexpr int True = 1;
+#endif
+#if defined( False )
+#  undef False
+constexpr int False = 0;
+#endif
+
 #if defined(__GNUC__)
 # define GCC_VERSION ( __GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__ )
 #endif
diff --git a/vulkan/vulkan.hpp b/vulkan/vulkan.hpp
index 9272162..f0fd72b 100644
--- a/vulkan/vulkan.hpp
+++ b/vulkan/vulkan.hpp
@@ -140,6 +140,17 @@ static_assert( VK_HEADER_VERSION == 256, "Wrong VK_HEADER_VERSION!" );
 #  undef MemoryBarrier
 #endif
 
+// XLib.h defines True/False, which collides with our vk::True/vk::False
+// ->  undef them and provide some namepace-secure constexpr
+#if defined( True )
+#  undef True
+constexpr int True = 1;
+#endif
+#if defined( False )
+#  undef False
+constexpr int False = 0;
+#endif
+
 #if defined( __GNUC__ )
 #  define GCC_VERSION ( __GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__ )
 #endif