diff --git a/base/Makefile.am b/base/Makefile.am
index 277f44488..02dbf489d 100644
--- a/base/Makefile.am
+++ b/base/Makefile.am
@@ -32,7 +32,7 @@ sources += LieVector.cpp
 check_PROGRAMS += tests/testLieVector tests/testLieScalar
 
 # Data structures
-headers += BTree.h DSF.h
+headers += BTree.h DSF.h FastMap.h
 sources += DSFVector.cpp
 check_PROGRAMS += tests/testBTree tests/testDSF tests/testDSFVector