diff --git a/.flake8 b/.flake8
index 9d134c4da678cd330c2345c02a280fa97267ad8a..d094b4eb6b32f59bce9e7c97b0dc689a1f302047 100644
--- a/.flake8
+++ b/.flake8
@@ -10,4 +10,7 @@ exclude = .git,__pycache,node_modules
 #   E131: continuation line unaligned for hanging indent
 # - short variables should be avoided, but not currently enforced
 #   E741: do not use variables named ‘l’, ‘O’, or ‘I’
-ignore = E122, E126, E127, E128, E131, E741
+# - both W503 and W504 are enabled, but contradictory.
+#   code currently appears to adhere to W503.
+#   W504: line break after binary operator
+ignore = E122, E126, E127, E128, E131, E741, W504
diff --git a/test/imfv283_test/IMFV283Parser_test.py b/test/imfv283_test/IMFV283Parser_test.py
index e9e3c3bda1f9084ea55911736fa8abc6bf20be14..0381560745a20ef6bdc6dbac28d48ae8b86c0847 100644
--- a/test/imfv283_test/IMFV283Parser_test.py
+++ b/test/imfv283_test/IMFV283Parser_test.py
@@ -7,9 +7,9 @@ from geomagio.imfv283 import IMFV283Parser, imfv283_codes
 
 
 IMFV283_EXAMPLE_VIC = '75C2A3A814023012741G43-1NN027EUP00191`A^P@RVxZ}|' + \
-    'D@@B_BEM@@@@@@@@@@@@@@@@@@@@@@@@@@@E|BxtTADVD@\E\BxxT@tVCh\\E' + \
-    'lByDT@xVCp\\EdBy@T@tVCh\EhByPT@xVCl\\EPBy@T@tVCd\EdBxlTA@VCp\\Eh' + \
-    'BxTTA@VCp\\EdBGxTA@VCl\EPBG`T@xVC\\\\DtBGHT@lVCD\DPBG@T@XVBh\\'
+    'D@@B_BEM@@@@@@@@@@@@@@@@@@@@@@@@@@@E|BxtTADVD@\\E\BxxT@tVCh\\E' + \
+    'lByDT@xVCp\\EdBy@T@tVCh\\EhByPT@xVCl\\EPBy@T@tVCd\\EdBxlTA@VCp\\Eh' + \
+    'BxTTA@VCp\\EdBGxTA@VCl\\EPBG`T@xVC\\\\DtBGHT@lVCD\DPBG@T@XVBh\\'
 
 IMFV283_EXAMPLE_FRD = '75C2102614023012927G43-0NN027EUP00191bx@WyhD{' + \
     'aDB~@X@{Bb@@@@@@@@@@@@@@@@@@@@@@@@@@@@[DAV[@cUAjT@[EAVZ@cUAjT@[' + \