diff --git a/iso/builder/build.sh b/iso/builder/build.sh
index 5ec4120..e70784c 100755
--- a/iso/builder/build.sh
+++ b/iso/builder/build.sh
@@ -180,7 +180,7 @@ if [ "$GPU_STRESS_NEED_BUILD" = "1" ]; then
         -I"${CUBLAS_CACHE}/include" \
         -o "$GPU_STRESS_BIN" \
         "${BUILDER_DIR}/bee-gpu-stress.c" \
-        -ldl
+        -ldl -lm
     echo "binary: $GPU_STRESS_BIN"
 else
     echo "=== bee-gpu-stress up to date, skipping build ==="