diff --git a/tests/cocotb/prepare.sh b/tests/cocotb/prepare.sh
index 5e3ed1e72..cc4b6b82c 100755
--- a/tests/cocotb/prepare.sh
+++ b/tests/cocotb/prepare.sh
@@ -16,9 +16,10 @@ source venv-cocotb/bin/activate
 python -m pip install cython wheel setuptools
 python -m pip install pylibfdt fdt
 python -m pip install scapy
-python -m pip install $PKG_PYNFB 
-python -m pip install $PKG_LIBNFBEXT_PYTHON 
-python -m pip install $PKG_COCOTBEXT_OFM 
+python -m pip wheel -w ./cocotbwheels $PKG_PYNFB
+python -m pip install --find-links ./cocotbwheels nfb
+python -m pip install --find-links ./cocotbwheels $PKG_LIBNFBEXT_PYTHON
+python -m pip install $PKG_COCOTBEXT_OFM
 
 echo ""
 echo "Now activate environment with:"