diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 4bdd02159b..1143799cf2 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -769,6 +769,7 @@ SKIPHEADERS-$(CONFIG_MPEG_XVMC_DECODER) += xvmc.h
 SKIPHEADERS-$(CONFIG_VAAPI)            += vaapi_internal.h
 SKIPHEADERS-$(CONFIG_VDA)              += vda_internal.h
 SKIPHEADERS-$(CONFIG_VDPAU)            += vdpau.h
+SKIPHEADERS-$(HAVE_OS2THREADS)         += os2threads.h
 SKIPHEADERS-$(HAVE_W32THREADS)         += w32pthreads.h
 
 TESTPROGS = cabac                                                       \