diff --git a/CMakeLists.txt b/CMakeLists.txt
index b95523f6e..ec5fac7f5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -102,6 +102,8 @@ if (${HAVE_STDBOOL_H})
   add_definitions(-DHAVE_STDBOOL_H)
 endif ()
 
+# https://github.com/harfbuzz/harfbuzz/pull/2874#issuecomment-782859099
+if (NOT WIN32) add_definitions("-DHAVE_PTHREAD") endif ()
 
 if (MSVC)
   add_definitions(-wd4244 -wd4267 -D_CRT_SECURE_NO_WARNINGS -D_CRT_NONSTDC_NO_WARNINGS)