diff --git a/daemon/.gitignore b/daemon/.gitignore
index fc91c5159..d92e6dbff 100644
--- a/daemon/.gitignore
+++ b/daemon/.gitignore
@@ -17,3 +17,4 @@ streambuf.c
 ssllib.c
 dtmflib.c
 *-test
+dtmf_rx_fillin.h
diff --git a/daemon/Makefile b/daemon/Makefile
index 35adf4a2a..91b7edc7a 100644
--- a/daemon/Makefile
+++ b/daemon/Makefile
@@ -139,4 +139,8 @@ MANS=		$(PODS:.pod=.8)
 
 include ../lib/common.Makefile
 
+ifeq ($(with_transcoding),yes)
+.depend:	dtmf_rx_fillin.h
+endif
+
 include		.depend
diff --git a/daemon/codec.c b/daemon/codec.c
index e6d7c6b3f..c88c90c0b 100644
--- a/daemon/codec.c
+++ b/daemon/codec.c
@@ -17,6 +17,7 @@
 #include "dtmf.h"
 #include "resample.h"
 #include "dtmflib.h"
+#include "dtmf_rx_fillin.h"
 
 
 
diff --git a/lib/common.Makefile b/lib/common.Makefile
index 86c9707ff..d9454fd7d 100644
--- a/lib/common.Makefile
+++ b/lib/common.Makefile
@@ -11,7 +11,7 @@ debug:
 
 dep:		.depend
 
-BUILD_TEST_ALTS = fix_frame_channel_layout.h
+BUILD_TEST_ALTS = fix_frame_channel_layout.h dtmf_rx_fillin.h
 
 clean:
 	rm -f $(OBJS) $(TARGET) $(LIBSRCS) $(DAEMONSRCS) $(MANS) $(ADD_CLEAN) .depend core core.*
diff --git a/lib/dtmf_rx_fillin-01.h b/lib/dtmf_rx_fillin-01.h
new file mode 100644
index 000000000..ce062b0e1
--- /dev/null
+++ b/lib/dtmf_rx_fillin-01.h
@@ -0,0 +1,7 @@
+#include <sys/types.h>
+#include <inttypes.h>
+#include <stdio.h>
+#include <spandsp/telephony.h>
+#include <spandsp/super_tone_rx.h>
+#include <spandsp/logging.h>
+#include <spandsp/dtmf.h>
diff --git a/lib/dtmf_rx_fillin-02.h b/lib/dtmf_rx_fillin-02.h
new file mode 100644
index 000000000..0d5528b64
--- /dev/null
+++ b/lib/dtmf_rx_fillin-02.h
@@ -0,0 +1,12 @@
+#include <sys/types.h>
+#include <inttypes.h>
+#include <stdio.h>
+#include <spandsp/telephony.h>
+#include <spandsp/super_tone_rx.h>
+#include <spandsp/logging.h>
+#include <spandsp/dtmf.h>
+#include "compat.h"
+
+INLINE void dtmf_rx_fillin(dtmf_rx_state_t *dsp, int n) {
+	// stub
+}
diff --git a/lib/dtmf_rx_fillin-test.c b/lib/dtmf_rx_fillin-test.c
new file mode 100644
index 000000000..28ddda527
--- /dev/null
+++ b/lib/dtmf_rx_fillin-test.c
@@ -0,0 +1,6 @@
+#include "dtmf_rx_fillin.h"
+int main(void) {
+	dtmf_rx_state_t *dsp = NULL;
+	dtmf_rx_fillin(dsp, 0);
+	return 0;
+}
diff --git a/t/.gitignore b/t/.gitignore
index bf2a12647..bcf4c6fdc 100644
--- a/t/.gitignore
+++ b/t/.gitignore
@@ -51,3 +51,4 @@ media_player.c
 dtmflib.c
 test-dtmf-detect
 *-test
+dtmf_rx_fillin.h
diff --git a/t/Makefile b/t/Makefile
index effb90920..2b39a551e 100644
--- a/t/Makefile
+++ b/t/Makefile
@@ -133,3 +133,7 @@ const_str_hash-test.strhash: const_str_hash-test.strhash.o $(COMMONOBJS)
 
 tests-preload.so:	tests-preload.c
 	$(CC) -g -D_GNU_SOURCE -std=c99 -o $@ -Wall -shared -fPIC $<
+
+ifeq ($(with_transcoding),yes)
+.depend: dtmf_rx_fillin.h
+endif