diff --git a/misc/rbutil/rbutil.SlackBuild b/misc/rbutil/rbutil.SlackBuild
index d8aa1c5f88..37cee5c07c 100644
--- a/misc/rbutil/rbutil.SlackBuild
+++ b/misc/rbutil/rbutil.SlackBuild
@@ -116,6 +116,7 @@ cd utils/build
     -DBUILD_SHARED_LIBS=OFF \
     -DCCACHE_PROGRAM=FALSE \
     -DUSE_SYSTEM_QUAZIP=ON \
+    -DCMAKE_EXE_LINKER_FLAGS="-lgmp" \
     ..
   make
   install -D -m 0755 -s rbutilqt/RockboxUtility $PKG/usr/bin/RockboxUtility