diff --git a/lib/matplotlib/backends/registry.py b/lib/matplotlib/backends/registry.py
index 3c85a9b47d7b..7f5a53f917a4 100644
--- a/lib/matplotlib/backends/registry.py
+++ b/lib/matplotlib/backends/registry.py
@@ -407,7 +407,7 @@ def resolve_gui_or_backend(self, gui_or_backend):
return self.resolve_backend(gui_or_backend)
except Exception: # KeyError ?
raise RuntimeError(
- f"'{gui_or_backend} is not a recognised GUI loop or backend name")
+ f"'{gui_or_backend}' is not a recognised GUI loop or backend name")
# Singleton
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