diff --git a/ruby/video/direct3d.cpp b/ruby/video/direct3d.cpp
index 905fb161..2549506d 100755
--- a/ruby/video/direct3d.cpp
+++ b/ruby/video/direct3d.cpp
@@ -4,7 +4,7 @@
 #undef interface
 
 static LRESULT CALLBACK VideoDirect3D9_WindowProcedure(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam) {
-  if(msg == WM_SYSKEYDOWN && waram == VK_F4) return false;
+  if(msg == WM_SYSKEYDOWN && wparam == VK_F4) return false;
   return DefWindowProc(hwnd, msg, wparam, lparam);
 }
 
diff --git a/ruby/video/directdraw.cpp b/ruby/video/directdraw.cpp
index 7b6aeff5..1902a56e 100755
--- a/ruby/video/directdraw.cpp
+++ b/ruby/video/directdraw.cpp
@@ -2,7 +2,7 @@
 #undef interface
 
 static LRESULT CALLBACK VideoDirectDraw7_WindowProcedure(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam) {
-  if(msg == WM_SYSKEYDOWN && waram == VK_F4) return false;
+  if(msg == WM_SYSKEYDOWN && wparam == VK_F4) return false;
   return DefWindowProc(hwnd, msg, wparam, lparam);
 }
 
diff --git a/ruby/video/gdi.cpp b/ruby/video/gdi.cpp
index 7d935d37..52297248 100755
--- a/ruby/video/gdi.cpp
+++ b/ruby/video/gdi.cpp
@@ -1,5 +1,5 @@
 static LRESULT CALLBACK VideoGDI_WindowProcedure(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam) {
-  if(msg == WM_SYSKEYDOWN && waram == VK_F4) return false;
+  if(msg == WM_SYSKEYDOWN && wparam == VK_F4) return false;
   return DefWindowProc(hwnd, msg, wparam, lparam);
 }
 
diff --git a/ruby/video/wgl.cpp b/ruby/video/wgl.cpp
index 01982382..e1ed8627 100755
--- a/ruby/video/wgl.cpp
+++ b/ruby/video/wgl.cpp
@@ -4,7 +4,7 @@
 #define WGL_CONTEXT_MINOR_VERSION_ARB 0x2092
 
 static LRESULT CALLBACK VideoOpenGL32_WindowProcedure(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam) {
-  if(msg == WM_SYSKEYDOWN && waram == VK_F4) return false;
+  if(msg == WM_SYSKEYDOWN && wparam == VK_F4) return false;
   return DefWindowProc(hwnd, msg, wparam, lparam);
 }