diff --git a/hardware0.hpp b/hardware0.hpp
index 9260d68..009241d 100644
--- a/hardware0.hpp
+++ b/hardware0.hpp
@@ -128,7 +128,7 @@ class Hardware0<cfg, Driven::INTERRUPT, mode>
 
 //////////////////////////////////////////////////////////////////////////
 
-#ifndef UART0_NO_INT_VECTORS
+#ifdef UART0_INT_VECTORS
 
 #include <avr/interrupt.h>
 
@@ -164,4 +164,6 @@ ISR(USART0_UDRE_vect)
 } // namespace detail
 } // namespace uart
 
+#undef UART0_INT_VECTORS
+
 #endif
diff --git a/hardware1.hpp b/hardware1.hpp
index 42a8c41..97b2b3a 100644
--- a/hardware1.hpp
+++ b/hardware1.hpp
@@ -132,7 +132,7 @@ class Hardware1<cfg, Driven::INTERRUPT, mode>
 
 //////////////////////////////////////////////////////////////////////////
 
-#ifndef UART1_NO_INT_VECTORS
+#ifdef UART1_INT_VECTORS
 
 #include <avr/interrupt.h>
 
@@ -161,4 +161,6 @@ ISR(USART1_UDRE_vect)
 } // namespace detail
 } // namespace uart
 
+#undef UART1_INT_VECTORS
+
 #endif
diff --git a/uart.hpp b/uart.hpp
index 77aa096..fb2f715 100644
--- a/uart.hpp
+++ b/uart.hpp
@@ -3,11 +3,14 @@
 #include <stdint.h>
 
 #include "config.hpp"
-#include "hardware0.hpp"
-#include "hardware1.hpp"
 #include "software.hpp"
 #include "utils.hpp"
 
+#undef UART0_INT_VECTORS
+#include "hardware0.hpp"
+#undef UART1_INT_VECTORS
+#include "hardware1.hpp"
+
 #include "../flash/flash.hpp"
 
 #define FORCE_INLINE __attribute__((always_inline))