diff --git a/Makefile.am b/Makefile.am
index 5ad6432cd..82ffe39f2 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -212,6 +212,7 @@ lmms_SOURCES =								\
 		$(srcdir)/include/audio_sdl.h				\
 		$(srcdir)/include/interpolation.h			\
 		$(srcdir)/include/lmms_constants.h			\
+		$(srcdir)/include/lmms_math.h				\
 		$(srcdir)/include/mixer.h				\
 		$(srcdir)/include/pattern.h				\
 		$(srcdir)/include/instrument_track.h			\