--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -289,15 +289,8 @@ elseif(UNIX)
 			RENAME endless-sky.png)
 	endforeach()
 
-	# Gzip and install man file.
-	add_custom_command(
-		OUTPUT endless-sky.6.gz
-		COMMAND gzip -c endless-sky.6 > ${CMAKE_CURRENT_BINARY_DIR}/endless-sky.6.gz
-		DEPENDS endless-sky.6
-		WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
-		VERBATIM)
-	target_sources(EndlessSky PRIVATE endless-sky.6.gz)
-	install(FILES ${CMAKE_CURRENT_BINARY_DIR}/endless-sky.6.gz DESTINATION share/man/man6)
+  # Install man file.
+  install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/endless-sky.6 DESTINATION share/man/man6)
 
 	# Install the resource files.
 	install(DIRECTORY data DESTINATION share/games/endless-sky)