diff --git a/CMakeLists.txt b/CMakeLists.txt
index 362173cac..f9a12f118 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -49,6 +49,10 @@ IF(NOT DEFINED SHAREDIR)
   SET(SHAREDIR ${CMAKE_INSTALL_PREFIX}/share)
 ENDIF(NOT DEFINED SHAREDIR)
 
+IF(NOT DEFINED MANDIR)
+  SET(MANDIR ${SHAREDIR}/man)
+ENDIF(NOT DEFINED MANDIR)
+
 IF(NOT DEFINED LOCALEDIR)
   SET(LOCALEDIR ${SHAREDIR}/locale)
 ENDIF(NOT DEFINED LOCALEDIR)
diff --git a/doc/CMakeLists.txt b/doc/CMakeLists.txt
index 89f8be3b6..f36395270 100644
--- a/doc/CMakeLists.txt
+++ b/doc/CMakeLists.txt
@@ -35,4 +35,4 @@ IF(ENABLE_DOC)
 
 ENDIF(ENABLE_DOC)
 
-INSTALL(FILES ${CMAKE_CURRENT_SOURCE_DIR}/weechat-curses.1 DESTINATION ${SHAREDIR}/man/man1)
+INSTALL(FILES ${CMAKE_CURRENT_SOURCE_DIR}/weechat-curses.1 DESTINATION ${MANDIR}/man1)