diff --git a/stackrc b/stackrc
index d7ebdd87d4..a9f3c32887 100644
--- a/stackrc
+++ b/stackrc
@@ -720,11 +720,11 @@ EXTRA_CACHE_URLS=""
 
 # etcd3 defaults
 ETCD_VERSION=${ETCD_VERSION:-v3.1.10}
-ETCD_SHA256_AMD64="2d335f298619c6fb02b1124773a56966e448ad9952b26fea52909da4fe80d2be"
+ETCD_SHA256_AMD64=${ETCD_SHA256_AMD64:-"2d335f298619c6fb02b1124773a56966e448ad9952b26fea52909da4fe80d2be"}
 # NOTE(sdague): etcd v3.1.10 doesn't have anything for these architectures, though 3.2.x does.
-ETCD_SHA256_ARM64=""
-ETCD_SHA256_PPC64=""
-ETCD_SHA256_S390X=""
+ETCD_SHA256_ARM64=${ETCD_SHA256_ARM64:-""}
+ETCD_SHA256_PPC64=${ETCD_SHA256_PPC64:-""}
+ETCD_SHA256_S390X=${ETCD_SHA256_S390X:-""}
 # Make sure etcd3 downloads the correct architecture
 if is_arch "x86_64"; then
     ETCD_ARCH="amd64"