diff --git a/Makefile.am b/Makefile.am
index 17f3eb6..9821775 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -136,7 +136,8 @@
   src/util/dynamic-uint8-vector.cpp \
   src/util/dynamic-uint8-vector.hpp \
   src/util/logging.cpp \
-  src/util/logging.hpp
+  src/util/logging.hpp \
+  src/util/string-helper.hpp
 
 libndn_cpp_la_LIBADD  = @OPENSSL_LIBS@ @OSX_SECURITY_LIBS@
 libndn_cpp_la_LDFLAGS = @OPENSSL_LDFLAGS@  @SQLITE3_LDFLAGS@ @BOOST_LDFLAGS@