diff --git a/src/Makefile.am b/src/Makefile.am
index aad95fd9..56368aa2 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -73,6 +73,8 @@ libiphreeqc_la_SOURCES=\
 	phreeqcpp/SSassemblage.h\
 	phreeqcpp/SS.cxx\
 	phreeqcpp/SS.h\
+	phreeqcpp/SScomp.cxx\
+	phreeqcpp/SScomp.h\
 	phreeqcpp/StorageBin.cxx\
 	phreeqcpp/StorageBin.h\
 	phreeqcpp/StorageBinList.cpp\