diff --git a/ci/docker/x86_64-unknown-illumos/Dockerfile b/ci/docker/x86_64-unknown-illumos/Dockerfile
index 9854bc9f6a..482c227058 100644
--- a/ci/docker/x86_64-unknown-illumos/Dockerfile
+++ b/ci/docker/x86_64-unknown-illumos/Dockerfile
@@ -1,7 +1,8 @@
 FROM rust-x86_64-unknown-illumos
 
 ENV \
-    AR_x86_64_unknown_illumos=x86_64-illumos-ar \
-    CC_x86_64_unknown_illumos=x86_64-illumos-gcc \
-    CXX_x86_64_unknown_illumos=x86_64-illumos-g++ \
-    CARGO_TARGET_X86_64_UNKNOWN_ILLUMOS_LINKER=x86_64-illumos-gcc
+  AR_x86_64_unknown_illumos="x86_64-illumos-ar" \
+  RANLIB_x86_64_unknown_illumos="x86_64-illumos-ranlib" \
+  CC_x86_64_unknown_illumos=x86_64-illumos-gcc \
+  CXX_x86_64_unknown_illumos=x86_64-illumos-g++ \
+  CARGO_TARGET_X86_64_UNKNOWN_ILLUMOS_LINKER=x86_64-illumos-gcc