diff --git a/packages/addons/service/softcam/oscam/build b/packages/addons/service/softcam/oscam/build
index ce80afb29f..c1b351c50f 100755
--- a/packages/addons/service/softcam/oscam/build
+++ b/packages/addons/service/softcam/oscam/build
@@ -33,6 +33,7 @@ cmake -DCMAKE_TOOLCHAIN_FILE=$CMAKE_CONF \
       -DHAVE_DVBAPI=1 -DWITH_STAPI=0 \
       -DMODULE_CAMD33=1 \
       -DWEBIF=1 \
+      -DOPTIONAL_INCLUDE_DIR=$SYSROOT_PREFIX/usr/include \
       ..
 
 make