diff --git a/.gitmodules b/.gitmodules
index 12a7b2b..5b4cacd 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -3,7 +3,7 @@
 	url = https://github.com/NordicSemiconductor/nrfx
 [submodule "lib/CMSIS"]
 	path = lib/CMSIS
-	url = https://github.com/ARM-software/CMSIS_5/
+	url = https://github.com/ARM-software/CMSIS_5
 [submodule "lib/mcuboot"]
 	path = lib/mcuboot
 	url = https://github.com/mcu-tools/mcuboot