diff --git a/libosmogsm.pc.in b/libosmogsm.pc.in
index 0aaf51e..17b9212 100644
--- a/libosmogsm.pc.in
+++ b/libosmogsm.pc.in
@@ -6,6 +6,6 @@
 Name: Osmocom GSM Core Library
 Description: GSM Core Library
 Version: @VERSION@
-Requires: talloc, libosmocore
+Requires: talloc, libosmocore, libosmoisdn
 Libs: -L${libdir} -losmogsm
 Cflags: -I${includedir}/