diff --git a/audio/softsynth/mt32/SampleRateConverter.cpp b/audio/softsynth/mt32/SampleRateConverter.cpp
index aec13263a3e..7beac346b70 100644
--- a/audio/softsynth/mt32/SampleRateConverter.cpp
+++ b/audio/softsynth/mt32/SampleRateConverter.cpp
@@ -14,7 +14,9 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <cstddef>
+#define MT32EMU_WITH_LIBSOXR_RESAMPLER 0
+#define MT32EMU_WITH_LIBSAMPLERATE_RESAMPLER 0
+#define MT32EMU_WITH_INTERNAL_RESAMPLER 1
 
 #include "SampleRateConverter.h"
 
diff --git a/audio/softsynth/mt32/module.mk b/audio/softsynth/mt32/module.mk
index 7c50f3edaac..5b7a602bb65 100644
--- a/audio/softsynth/mt32/module.mk
+++ b/audio/softsynth/mt32/module.mk
@@ -21,6 +21,12 @@ MODULE_OBJS := \
 	TVP.o \
 	sha1/sha1.o \
 	c_interface/c_interface.o \
+	srchelper/InternalResampler.o \
+	srchelper/srctools/src/FIRResampler.o \
+	srchelper/srctools/src/IIR2xResampler.o \
+	srchelper/srctools/src/LinearResampler.o \
+	srchelper/srctools/src/ResamplerModel.o \
+	srchelper/srctools/src/SincResampler.o \
 	SampleRateConverter.o
 
 # Include common rules