diff --git a/plugin/cpp/CMakeLists.txt b/plugin/cpp/CMakeLists.txt
index 9baf3b650..fdd57ea97 100644
--- a/plugin/cpp/CMakeLists.txt
+++ b/plugin/cpp/CMakeLists.txt
@@ -34,7 +34,7 @@ set_target_properties(transport-plugin PROPERTIES
 	VERSION ${TRANSPORT_VERSION} SOVERSION ${TRANSPORT_VERSION}
 )
 
-install(TARGETS transport-plugin LIBRARY DESTINATION ${LIB_install_DIR} ARCHIVE DESTINATION ${LIB_install_DIR} COMPONENT libraries)
+install(TARGETS transport-plugin LIBRARY DESTINATION ${LIB_INSTALL_DIR} ARCHIVE DESTINATION ${LIB_INSTALL_DIR} COMPONENT libraries)
 
 #configure_file(transport.pc.in "${CMAKE_CURRENT_SOURCE_DIR}/transport.pc")
 #install(FILES "${CMAKE_CURRENT_SOURCE_DIR}/transport.pc" DESTINATION lib/pkgconfig)
diff --git a/spectrum/src/frontends/slack/CMakeLists.txt b/spectrum/src/frontends/slack/CMakeLists.txt
index 3003113ee..676faec78 100644
--- a/spectrum/src/frontends/slack/CMakeLists.txt
+++ b/spectrum/src/frontends/slack/CMakeLists.txt
@@ -25,4 +25,4 @@ target_link_libraries(spectrum2-slack-frontend transport ${LOG4CXX_LIBRARIES} ${
 #      VERSION ${TRANSPORT_VERSION} SOVERSION ${TRANSPORT_VERSION}
 #)
 
-# install(TARGETS transport-plugin LIBRARY DESTINATION ${LIB_install_DIR} ARCHIVE DESTINATION ${LIB_install_DIR} COMPONENT libraries)
+# install(TARGETS transport-plugin LIBRARY DESTINATION ${LIB_INSTALL_DIR} ARCHIVE DESTINATION ${LIB_INSTALL_DIR} COMPONENT libraries)
diff --git a/spectrum/src/frontends/xmpp/CMakeLists.txt b/spectrum/src/frontends/xmpp/CMakeLists.txt
index e5dc31771..36bf81012 100644
--- a/spectrum/src/frontends/xmpp/CMakeLists.txt
+++ b/spectrum/src/frontends/xmpp/CMakeLists.txt
@@ -25,4 +25,4 @@ target_link_libraries(spectrum2-xmpp-frontend transport ${LOG4CXX_LIBRARIES} ${B
 #       VERSION ${TRANSPORT_VERSION} SOVERSION ${TRANSPORT_VERSION}
 # )
 
-# install(TARGETS transport-plugin LIBRARY DESTINATION ${LIB_install_DIR} ARCHIVE DESTINATION ${LIB_install_DIR} COMPONENT libraries)
+# install(TARGETS transport-plugin LIBRARY DESTINATION ${LIB_INSTALL_DIR} ARCHIVE DESTINATION ${LIB_INSTALL_DIR} COMPONENT libraries)