diff --git a/include/osmocom/gsm/gsm0502.h b/include/osmocom/gsm/gsm0502.h
index de92c63..46b629e 100644
--- a/include/osmocom/gsm/gsm0502.h
+++ b/include/osmocom/gsm/gsm0502.h
@@ -32,4 +32,7 @@
 	return (imsi % 1000) % (bs_cc_chans * n_pag_blocks) % n_pag_blocks;
 }
 
+unsigned int
+gsm0502_calc_paging_group(struct gsm48_control_channel_descr *chan_desc, uint64_t imsi);
+
 #endif
diff --git a/include/osmocom/gsm/rsl.h b/include/osmocom/gsm/rsl.h
index 2eb045f..44ded1b 100644
--- a/include/osmocom/gsm/rsl.h
+++ b/include/osmocom/gsm/rsl.h
@@ -3,6 +3,7 @@
 
 #include <stdint.h>
 #include <osmocom/core/utils.h>
+#include <osmocom/core/msgb.h>
 #include <osmocom/gsm/protocol/gsm_08_58.h>
 
 void rsl_init_rll_hdr(struct abis_rsl_rll_hdr *dh, uint8_t msg_type);