diff --git a/install-scripts/install-macos.sh b/install-scripts/install-macos.sh
index c42d7c7307..cfa3dfb896 100755
--- a/install-scripts/install-macos.sh
+++ b/install-scripts/install-macos.sh
@@ -9,7 +9,12 @@ source "$HOME/.cargo/env"
 rustc --version
 
 # Install pyenv
-brew install pyenv gmp
+brew install pyenv
+
+# install gmp if it wasn't intalled before
+if ! type foobar &> /dev/null; then
+    brew install gmp
+fi
 
 # Make sure pyenv has been installed correctly
 pyenv -v