diff --git a/python/transmitter/CMakeLists.txt b/python/transmitter/CMakeLists.txt
index 121ac8a..c32d6e1 100644
--- a/python/transmitter/CMakeLists.txt
+++ b/python/transmitter/CMakeLists.txt
@@ -19,5 +19,6 @@
 
 GR_PYTHON_INSTALL(
     FILES
-    txtime_bursts_tagger.py DESTINATION ${GR_PYTHON_DIR}/grgsm
+    txtime_bursts_tagger.py
+    gsm_gmsk_mod.py DESTINATION ${GR_PYTHON_DIR}/grgsm
 )