diff --git a/stp/regen_makefile.sh b/stp/regen_makefile.sh
index be96829..0b90687 100755
--- a/stp/regen_makefile.sh
+++ b/stp/regen_makefile.sh
@@ -1,7 +1,25 @@
 #!/bin/sh
 
-FILES="*.ttcn *.ttcnpp SCCP_EncDec.cc SCTPasp_PT.cc TCCConversion.cc  TCCInterface.cc IPL4asp_PT.cc IPL4asp_discovery.cc IPA_CodecPort_CtrlFunctDef.cc TELNETasp_PT.cc Native_FunctionDefs.cc TCCEncoding.cc M3UA_CodecPort_CtrlFunctDef.cc "
+FILES="
+	*.ttcn
+	*.ttcnpp
+	SCCP_EncDec.cc
+	SCTPasp_PT.cc
+	TCCConversion.cc
+	TCCInterface.cc
+	IPL4asp_PT.cc
+	IPL4asp_discovery.cc
+	IPA_CodecPort_CtrlFunctDef.cc
+	TELNETasp_PT.cc
+	Native_FunctionDefs.cc
+	TCCEncoding.cc
+	M3UA_CodecPort_CtrlFunctDef.cc
+"
 
-export CPPFLAGS_TTCN3="-DIPA_EMULATION_CTRL -DIPA_EMULATION_SCCP -DUSE_MTP3_DISTRIBUTOR"
+export CPPFLAGS_TTCN3="
+	-DIPA_EMULATION_CTRL
+	-DIPA_EMULATION_SCCP
+	-DUSE_MTP3_DISTRIBUTOR
+"
 
 ../regen-makefile.sh STP_Tests.ttcn $FILES