diff --git a/lib/matplotlib/__init__.py b/lib/matplotlib/__init__.py
index 5f964e0b34de..56c76c58acf1 100644
--- a/lib/matplotlib/__init__.py
+++ b/lib/matplotlib/__init__.py
@@ -474,7 +474,8 @@ def impl(args, regex, min_ver=None, ignore_exit_code=False):
                     "Failed to find an ImageMagick installation")
         else:
             path = "convert"
-        info = impl([path, "--version"], r"^Version: ImageMagick (\S*)")
+        # Ignore deprecation warning for "convert" on IM>=7.1.1-33.
+        info = impl([path, "--version"], r"(?sm:.*^)Version: ImageMagick (\S*)")
         if info.raw_version == "7.0.10-34":
             # https://github.com/ImageMagick/ImageMagick/issues/2720
             raise ExecutableNotFoundError(