diff --git a/legacy/ephysics/src/lib/Makefile.am b/legacy/ephysics/src/lib/Makefile.am
index 8e02c2ce6c..5e040b3951 100644
--- a/legacy/ephysics/src/lib/Makefile.am
+++ b/legacy/ephysics/src/lib/Makefile.am
@@ -26,4 +26,4 @@ libephysics_la_SOURCES = $(base_sources)
 libephysics_la_LIBADD = @EPHYSICS_LIBS@ @EVIL_LIBS@ -lm
 libephysics_la_LDFLAGS = -no-undefined @lt_enable_auto_import@ -version-info @version_info@ @release_info@
 
-EXTRA_DIST = ephysics_private.h
+EXTRA_DIST = ephysics_private.h ephysics_trimesh.h