diff --git a/libretro/Makefile.common b/libretro/Makefile.common
index 3025492b..c869e78d 100644
--- a/libretro/Makefile.common
+++ b/libretro/Makefile.common
@@ -46,4 +46,5 @@ SOURCES_CXX := $(CORE_DIR)/apu/apu.cpp \
 				 $(CORE_DIR)/spc7110.cpp \
 				 $(CORE_DIR)/srtc.cpp \
 				 $(CORE_DIR)/tile.cpp \
+                                 $(CORE_DIR)/msu1.cpp \
 				 $(CORE_DIR)/libretro/libretro.cpp
diff --git a/msu1.cpp b/msu1.cpp
index 8c5f0bc7..1aa01d88 100644
--- a/msu1.cpp
+++ b/msu1.cpp
@@ -196,8 +196,6 @@
 #include <fstream>
 #include <cerrno>
 
-#define APU_DEFAULT_INPUT_RATE		32000
-
 std::ifstream dataFile, audioFile;
 uint32 audioLoopPos;
 uint32 partial_samples;