diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 18270626..ed5845d4 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -81,6 +81,7 @@ if (PKG_CONFIG_FOUND AND WITH_FFMPEG)
   set (EXTRA_INCLUDES ${EXTRA_INCLUDES} ${AVCODEC_INCLUDE_DIRS})
 
   set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DENABLE_FFMPEG")
+  set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DENABLE_HARDSUBX")
 endif (PKG_CONFIG_FOUND AND WITH_FFMPEG)
 
 ########################################################
diff --git a/src/lib_ccx/CMakeLists.txt b/src/lib_ccx/CMakeLists.txt
index c2bb9d24..e44416bb 100644
--- a/src/lib_ccx/CMakeLists.txt
+++ b/src/lib_ccx/CMakeLists.txt
@@ -18,6 +18,7 @@ if (WITH_FFMPEG)
     set (EXTRA_INCLUDES ${EXTRA_INCLUDES} ${AVCODEC_INCLUDE_DIRS})
 
   set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DENABLE_FFMPEG")
+  set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DENABLE_HARDSUBX")
 endif (WITH_FFMPEG)
 
 if (WITH_OCR)