diff --git a/projects/rnp/build.sh b/projects/rnp/build.sh
index 95439b6dc..5a2d7b074 100755
--- a/projects/rnp/build.sh
+++ b/projects/rnp/build.sh
@@ -48,6 +48,7 @@ cmake \
     -DBUILD_SHARED_LIBS=on \
     -DBUILD_TESTING=off \
     -DCMAKE_VERBOSE_MAKEFILE:BOOL=ON \
+    -DDOWNLOAD_SEXP:BOOL=ON \
     $SRC/rnp
 make -j$(nproc)