diff --git a/build-tools/lib/release.sh b/build-tools/lib/release.sh
index 35e3a28d231..280e248715c 100644
--- a/build-tools/lib/release.sh
+++ b/build-tools/lib/release.sh
@@ -187,10 +187,10 @@ function kube::release::md5() {
 }
 
 function kube::release::sha1() {
-  if which shasum >/dev/null 2>&1; then
-    shasum -a1 "$1" | awk '{ print $1 }'
-  else
+  if which sha1sum >/dev/null 2>&1; then
     sha1sum "$1" | awk '{ print $1 }'
+  else
+    shasum -a1 "$1" | awk '{ print $1 }'
   fi
 }
 
diff --git a/cluster/common.sh b/cluster/common.sh
index 3df52867fa3..c4be510641b 100755
--- a/cluster/common.sh
+++ b/cluster/common.sh
@@ -817,10 +817,10 @@ EOF
 }
 
 function sha1sum-file() {
-  if which shasum >/dev/null 2>&1; then
-    shasum -a1 "$1" | awk '{ print $1 }'
-  else
+  if which sha1sum >/dev/null 2>&1; then
     sha1sum "$1" | awk '{ print $1 }'
+  else
+    shasum -a1 "$1" | awk '{ print $1 }'
   fi
 }
 
diff --git a/cluster/get-kube-binaries.sh b/cluster/get-kube-binaries.sh
index 92acb286572..7fa7dd3c80f 100755
--- a/cluster/get-kube-binaries.sh
+++ b/cluster/get-kube-binaries.sh
@@ -104,10 +104,10 @@ function md5sum_file() {
 }
 
 function sha1sum_file() {
-  if which shasum >/dev/null 2>&1; then
-    shasum -a1 "$1" | awk '{ print $1 }'
-  else
+  if which sha1sum >/dev/null 2>&1; then
     sha1sum "$1" | awk '{ print $1 }'
+  else
+    shasum -a1 "$1" | awk '{ print $1 }'
   fi
 }