diff --git a/configs/sites/tier1/derecho/packages.yaml b/configs/sites/tier1/derecho/packages.yaml
index a3eb8e4f6..2de33fab5 100644
--- a/configs/sites/tier1/derecho/packages.yaml
+++ b/configs/sites/tier1/derecho/packages.yaml
@@ -7,6 +7,9 @@ packages:
   esmf:
     require:
     - 'esmf_os=Linux esmf_comm=mpich'
+  ewok-env:
+    require:
+    - '+ecflow'
 
 ### All other external packages listed alphabetically
   autoconf:
diff --git a/configs/sites/tier1/hercules/packages.yaml b/configs/sites/tier1/hercules/packages.yaml
index 7c438842b..823efda8e 100644
--- a/configs/sites/tier1/hercules/packages.yaml
+++ b/configs/sites/tier1/hercules/packages.yaml
@@ -1,4 +1,8 @@
 packages:
+# Modification of common packages
+  ewok-env:
+    require:
+    - '+ecflow'
   # For addressing https://github.com/JCSDA/spack-stack/issues/1355
   # Use system zlib instead of spack-built zlib-ng
   all:
diff --git a/configs/sites/tier1/orion/packages.yaml b/configs/sites/tier1/orion/packages.yaml
index 99675d2a4..f588f1b78 100644
--- a/configs/sites/tier1/orion/packages.yaml
+++ b/configs/sites/tier1/orion/packages.yaml
@@ -1,4 +1,8 @@
 packages:
+# Modification of common packages
+  ewok-env:
+    require:
+    - '+ecflow'
   # For addressing https://github.com/JCSDA/spack-stack/issues/1355
   #   Use system zlib instead of spack-built zlib-ng
   all: