diff --git a/CMakeLists.txt b/CMakeLists.txt
index 117ce528..f37eb6d5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -45,7 +45,7 @@ endif()
 #
 # ##############################################################################
 
-project(tesseract CXX)
+project(tesseract C CXX)
 
 # Get version with components from VERSION file.
 file(STRINGS "VERSION" VERSION_PLAIN)