diff --git a/src/lmic/lmic.h b/src/lmic/lmic.h
index 0584c41e..8a73d902 100644
--- a/src/lmic/lmic.h
+++ b/src/lmic/lmic.h
@@ -103,7 +103,7 @@ extern "C"{
 
 // Arduino LMIC version
 #define ARDUINO_LMIC_VERSION_CALC(major, minor, patch, local)	\
-	(((major) << 24u) | ((minor) << 16u) | ((patch) << 8u) | (local))
+	(((major) << UINT32_C(24)) | ((minor) << UINT32_C(16)) | ((patch) << UINT32_C(8)) | ((local << UINT32_C(0))))
 
 #define	ARDUINO_LMIC_VERSION	ARDUINO_LMIC_VERSION_CALC(3, 0, 99, 1)	/* v3.0.99.1 */