diff --git a/gbproxy/regen_makefile.sh b/gbproxy/regen_makefile.sh
index 34bd3f4cb..93ef71296 100755
--- a/gbproxy/regen_makefile.sh
+++ b/gbproxy/regen_makefile.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 FILES="*.ttcn *.ttcnpp BSSGP_EncDec.cc LLC_EncDec.cc IPL4asp_PT.cc IPL4asp_discovery.cc TCCConversion.cc TCCInterface.cc NS_CodecPort_CtrlFunctDef.cc RLCMAC_EncDec.cc Native_FunctionDefs.cc TELNETasp_PT.cc IPA_CodecPort_CtrlFunctDef.cc GTPU_EncDec.cc GTPC_EncDec.cc GTP_CodecPort_CtrlFunctDef.cc SCCP_EncDec.cc  SCTPasp_PT.cc "
 FILES+="AF_PACKET_PT.cc AF_PACKET_PT.hh "