diff --git a/build/cmake/contrib/gen_html/CMakeLists.txt b/build/cmake/contrib/gen_html/CMakeLists.txt
index 01d190672..958e9d173 100644
--- a/build/cmake/contrib/gen_html/CMakeLists.txt
+++ b/build/cmake/contrib/gen_html/CMakeLists.txt
@@ -27,4 +27,4 @@ ADD_CUSTOM_TARGET(zstd_manual.html ALL
                   ${GENHTML_BINARY} "${LIBVERSION}" "${LIBRARY_DIR}/zstd.h" "${PROJECT_BINARY_DIR}/zstd_manual.html"
                   DEPENDS gen_html COMMENT "Update zstd manual")
 
-INSTALL(FILES "${PROJECT_BINARY_DIR}/zstd_manual.html" DESTINATION "share/doc")
+INSTALL(FILES "${PROJECT_BINARY_DIR}/zstd_manual.html" DESTINATION "${CMAKE_INSTALL_PREFIX}/${DOC_INSTALL_DIR}")
diff --git a/build/cmake/programs/CMakeLists.txt b/build/cmake/programs/CMakeLists.txt
index 6c0ed05a1..ad8628f9a 100644
--- a/build/cmake/programs/CMakeLists.txt
+++ b/build/cmake/programs/CMakeLists.txt
@@ -45,9 +45,10 @@ IF (UNIX)
         COMMENT "Copying manpage zstd.1")
     ADD_CUSTOM_TARGET(zstdcat.1 ALL ${CMAKE_COMMAND} -E create_symlink zstd.1 zstdcat.1 DEPENDS zstd.1 COMMENT "Creating zstdcat.1 symlink")
     ADD_CUSTOM_TARGET(unzstd.1 ALL ${CMAKE_COMMAND} -E create_symlink zstd.1 unzstd.1 DEPENDS zstd.1 COMMENT "Creating unzstd.1 symlink")
-    INSTALL(FILES ${CMAKE_CURRENT_BINARY_DIR}/zstd.1 DESTINATION "share/man/man1")
-    INSTALL(FILES ${CMAKE_CURRENT_BINARY_DIR}/zstdcat.1 DESTINATION "share/man/man1")
-    INSTALL(FILES ${CMAKE_CURRENT_BINARY_DIR}/unzstd.1 DESTINATION "share/man/man1")
+
+    INSTALL(FILES ${CMAKE_CURRENT_BINARY_DIR}/zstd.1 DESTINATION "${MAN_INSTALL_DIR}")
+    INSTALL(FILES ${CMAKE_CURRENT_BINARY_DIR}/zstdcat.1 DESTINATION "${MAN_INSTALL_DIR}")
+    INSTALL(FILES ${CMAKE_CURRENT_BINARY_DIR}/unzstd.1 DESTINATION "${MAN_INSTALL_DIR}")
 
     ADD_EXECUTABLE(zstd-frugal ${PROGRAMS_DIR}/zstdcli.c ${PROGRAMS_DIR}/fileio.c)
     TARGET_LINK_LIBRARIES(zstd-frugal libzstd_static)