diff --git a/wxPython/src/gtk/_core.py b/wxPython/src/gtk/_core.py
index b1acfce0dd..09abfe6f0c 100644
--- a/wxPython/src/gtk/_core.py
+++ b/wxPython/src/gtk/_core.py
@@ -9444,7 +9444,7 @@ class Sizer(Object):
         """
         A convenience method for Show(item, False, recursive).
         """
-        return self.Show(item, false, recursive)
+        return self.Show(item, False, recursive)
 
     def ShowItems(*args, **kwargs):
         """
diff --git a/wxPython/src/mac/_core.py b/wxPython/src/mac/_core.py
index b1acfce0dd..09abfe6f0c 100644
--- a/wxPython/src/mac/_core.py
+++ b/wxPython/src/mac/_core.py
@@ -9444,7 +9444,7 @@ class Sizer(Object):
         """
         A convenience method for Show(item, False, recursive).
         """
-        return self.Show(item, false, recursive)
+        return self.Show(item, False, recursive)
 
     def ShowItems(*args, **kwargs):
         """
diff --git a/wxPython/src/msw/_core.py b/wxPython/src/msw/_core.py
index 58936956e9..5b1c5ad043 100644
--- a/wxPython/src/msw/_core.py
+++ b/wxPython/src/msw/_core.py
@@ -9513,7 +9513,7 @@ class Sizer(Object):
         """
         A convenience method for Show(item, False, recursive).
         """
-        return self.Show(item, false, recursive)
+        return self.Show(item, False, recursive)
 
     def ShowItems(*args, **kwargs):
         """