diff --git a/jwst/emicorr/emicorr.py b/jwst/emicorr/emicorr.py
index a8c537cdad..312ef8cc80 100644
--- a/jwst/emicorr/emicorr.py
+++ b/jwst/emicorr/emicorr.py
@@ -14,8 +14,9 @@
 try:
     import bottleneck as bn
 except ImportError as err:
-    msg = "Please install the bottleneck package for improved performance.  Falling back on numpy.  To install, use pip install bottleneck."
-    warnings.warn(msg)
+    warnings.warn("Please install the bottleneck package for improved "
+                  "performance.  Falling back on numpy.  To install, "
+                  "use pip install bottleneck.")
     bn = np   # set bn as an alias for numpy
 
 subarray_clocks = {