diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8951986..7a78f06 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -137,6 +137,10 @@ if(CMAKE_BUILD_TYPE MATCHES Debug OR CMAKE_BUILD_TYPE MATCHES DEBUG)
       "${CMAKE_SHARED_LINKER_FLAGS} -pg -no-pie -fno-builtin")
 endif(CMAKE_BUILD_TYPE MATCHES Debug OR CMAKE_BUILD_TYPE MATCHES DEBUG)
 
+if(NOT DEFINED CMAKE_INSTALL_MANDIR)
+    set(CMAKE_INSTALL_MANDIR "${CMAKE_INSTALL_PREFIX}/share/man")
+endif()
+
 install(TARGETS hyprpicker)
 install(FILES ${CMAKE_SOURCE_DIR}/doc/hyprpicker.1
         DESTINATION ${CMAKE_INSTALL_MANDIR}/man1)