diff --git a/Multiprotocol/Validate.h b/Multiprotocol/Validate.h
index 857a45c..19ad1f4 100644
--- a/Multiprotocol/Validate.h
+++ b/Multiprotocol/Validate.h
@@ -240,7 +240,7 @@
 #endif
 
 #if defined(ENABLE_DIRECT_INPUT)
-  #if defined(NABLE_SERIAL)  || defined(ENABLE_PPM)
+  #if defined(ENABLE_SERIAL)  || defined(ENABLE_PPM)
 		#error You must disable ENABLE_SERIAL and ENABLE_PPM before using ENABLE_DIRECT_INPUT
 	#endif
 #endif