diff --git a/.gitmodules b/.gitmodules
index 5b6e3ea2b3..8762d21276 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -75,3 +75,4 @@
 [submodule "src/lib/heatshrink/heatshrink"]
 	path = src/lib/heatshrink/heatshrink
 	url = https://github.com/PX4/heatshrink.git
+	branch = px4