diff --git a/plotly/matplotlylib/renderer.py b/plotly/matplotlylib/renderer.py
index d55f86ef3c2..71f5b207db0 100644
--- a/plotly/matplotlylib/renderer.py
+++ b/plotly/matplotlylib/renderer.py
@@ -14,14 +14,6 @@
 from plotly.matplotlylib import mpltools
 
 
-# Warning format
-def warning_on_one_line(msg, category, filename, lineno, file=None, line=None):
-    return "%s:%s: %s:\n\n%s\n\n" % (filename, lineno, category.__name__, msg)
-
-
-warnings.formatwarning = warning_on_one_line
-
-
 class PlotlyRenderer(Renderer):
     """A renderer class inheriting from base for rendering mpl plots in plotly.
 
diff --git a/plotly/tools.py b/plotly/tools.py
index 67f828204d7..b0875507439 100644
--- a/plotly/tools.py
+++ b/plotly/tools.py
@@ -55,14 +55,6 @@
 ALTERNATIVE_HISTNORM = "probability"
 
 
-# Warning format
-def warning_on_one_line(message, category, filename, lineno, file=None, line=None):
-    return "%s:%s: %s:\n\n%s\n\n" % (filename, lineno, category.__name__, message)
-
-
-warnings.formatwarning = warning_on_one_line
-
-
 ### mpl-related tools ###
 def mpl_to_plotly(fig, resize=False, strip_style=False, verbose=False):
     """Convert a matplotlib figure to plotly dictionary and send.