diff --git a/src/contour/CMakeLists.txt b/src/contour/CMakeLists.txt
index 0eebd585..5d0bc3c0 100644
--- a/src/contour/CMakeLists.txt
+++ b/src/contour/CMakeLists.txt
@@ -145,6 +145,16 @@ if(CONTOUR_BUILD_WITH_MIMALLOC)
     target_link_libraries(contour mimalloc)
 endif()
 
+if(APPLE)
+  add_custom_command(
+    TARGET contour POST_BUILD
+    WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}"
+    COMMAND codesign --force --sign - contour.app/Contents/MacOS/contour
+    COMMENT "Codesigning macOS bundle executable"
+    VERBATIM
+  )
+endif()
+
 if(NOT(WIN32))
     set(terminfo_file "contour.terminfo")
     set(terminfo_basedir "${CMAKE_CURRENT_BINARY_DIR}/terminfo")