diff --git a/.circleci/config2.yml b/.circleci/config2.yml
index e076baeb7..542c3d0d0 100644
--- a/.circleci/config2.yml
+++ b/.circleci/config2.yml
@@ -42,10 +42,6 @@ commands:
               if [[ << parameters.toolchain >> == rx-gcc ]]; then
                 mv toolchain.tar.gz toolchain.run
                 chmod +x toolchain.run
-                # rx-gcc is i386 binary
-                sudo dpkg --add-architecture i386
-                sudo apt update
-                sudo apt install libc6:i386 libncurses5:i386 libstdc++6:i386
                 ./toolchain.run -p ~/cache/<< parameters.toolchain >>/gnurx -y
               else
                 tar -C ~/cache/<< parameters.toolchain >> -xaf toolchain.tar.gz
@@ -92,6 +88,13 @@ commands:
               unzip ninja-linux.zip -d ~/bin
             fi
 
+            # rx-gcc is 32-bit binary
+            if [[ << parameters.toolchain >> == rx-gcc ]]; then
+              sudo dpkg --add-architecture i386
+              sudo apt update
+              sudo apt install libc6:i386 libstdc++6:i386 zlib1g:i386
+            fi
+
             # Install Pico SDK
             if [ << parameters.family >> == "rp2040" ]; then
               git clone --depth 1 https://github.com/raspberrypi/pico-sdk.git ~/pico-sdk