diff --git a/GNUmakefile b/GNUmakefile
index 9ee1949..896b32b 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -25,6 +25,10 @@ HEADERS += src/StreamFormatConverter.h
 HEADERS += src/StreamBuffer.h
 HEADERS += src/StreamError.h
 HEADERS += src/StreamVersion.h
+HEADERS += src/StreamProtocol.h
+HEADERS += src/StreamBusInterface.h
+HEADERS += src/StreamCore.h
+HEADERS += src/MacroMagic.h
 
 CPPFLAGS += -DSTREAM_INTERNAL -I$(COMMON_DIR)
 
diff --git a/src/Makefile b/src/Makefile
index 280a219..3a59954 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -71,6 +71,10 @@ INC += StreamFormatConverter.h
 INC += StreamBuffer.h
 INC += StreamError.h
 INC += StreamVersion.h
+INC += StreamProtocol.h
+INC += StreamBusInterface.h
+INC += StreamCore.h
+INC += MacroMagic.h
 
 # switch off annoying rset warnings in 3.16+
 CPPFLAGS += -DUSE_TYPED_RSET