diff --git a/clover/CMakeLists.txt b/clover/CMakeLists.txt
index 5cde1ffb..9b717d68 100644
--- a/clover/CMakeLists.txt
+++ b/clover/CMakeLists.txt
@@ -44,6 +44,10 @@ find_package(OpenCV ${_opencv_version} REQUIRED
     imgproc
 )
 
+# Fix https://travis-ci.org/github/CopterExpress/clover/jobs/766318908#L6536
+set(THREADS_PREFER_PTHREAD_FLAG ON)
+find_package(Threads REQUIRED)
+
 ## System dependencies are found with CMake's conventions
 # find_package(Boost REQUIRED COMPONENTS system)