diff --git a/include/bx/config.h b/include/bx/config.h
index 1df378d..dea60b9 100644
--- a/include/bx/config.h
+++ b/include/bx/config.h
@@ -12,22 +12,6 @@
 #	define BX_CONFIG_ALLOCATOR_DEBUG 0
 #endif // BX_CONFIG_DEBUG_ALLOC
 
-#ifndef BX_CONFIG_CRT_FILE_READER_WRITER
-#	define BX_CONFIG_CRT_FILE_READER_WRITER !(0 \
-			|| BX_CRT_NONE                      \
-			)
-#endif // BX_CONFIG_CRT_FILE_READER_WRITER
-
-#ifndef BX_CONFIG_CRT_PROCESS
-#	define BX_CONFIG_CRT_PROCESS !(0  \
-			|| BX_CRT_NONE            \
-			|| BX_PLATFORM_EMSCRIPTEN \
-			|| BX_PLATFORM_PS4        \
-			|| BX_PLATFORM_WINRT      \
-			|| BX_PLATFORM_XBOXONE    \
-			)
-#endif // BX_CONFIG_CRT_PROCESS
-
 #ifndef BX_CONFIG_SUPPORTS_THREADING
 #	define BX_CONFIG_SUPPORTS_THREADING !(0 \
 			|| BX_PLATFORM_EMSCRIPTEN       \
diff --git a/src/crtimpl.cpp b/src/crtimpl.cpp
index 2cc62f7..8466509 100644
--- a/src/crtimpl.cpp
+++ b/src/crtimpl.cpp
@@ -8,6 +8,22 @@
 #include <stdio.h>
 #include <malloc.h>
 
+#ifndef BX_CONFIG_CRT_FILE_READER_WRITER
+#	define BX_CONFIG_CRT_FILE_READER_WRITER !(0 \
+			|| BX_CRT_NONE                      \
+			)
+#endif // BX_CONFIG_CRT_FILE_READER_WRITER
+
+#ifndef BX_CONFIG_CRT_PROCESS
+#	define BX_CONFIG_CRT_PROCESS !(0  \
+			|| BX_CRT_NONE            \
+			|| BX_PLATFORM_EMSCRIPTEN \
+			|| BX_PLATFORM_PS4        \
+			|| BX_PLATFORM_WINRT      \
+			|| BX_PLATFORM_XBOXONE    \
+			)
+#endif // BX_CONFIG_CRT_PROCESS
+
 namespace bx
 {
 	DefaultAllocator::DefaultAllocator()