diff --git a/bundles/org.eclipse.swt/Eclipse SWT PI/win32/library/os_custom.c b/bundles/org.eclipse.swt/Eclipse SWT PI/win32/library/os_custom.c
index cddc8d5f17..606f5bcb00 100644
--- a/bundles/org.eclipse.swt/Eclipse SWT PI/win32/library/os_custom.c	
+++ b/bundles/org.eclipse.swt/Eclipse SWT PI/win32/library/os_custom.c	
@@ -79,10 +79,6 @@ BOOL Validate_AllowDarkModeForWindow(const BYTE* functionPtr)
 	}
 
 	return FALSE;
-#elif defined(_M_ARM64)
-	/* No implementation needed for Windows 11 on Arm64 */
-	functionPtr; /* to prevent: warning C4100: 'functionPtr': unreferenced formal parameter */
-	return TRUE;
 #else
 	#error Unsupported processor type
 #endif
@@ -133,10 +129,6 @@ BOOL Validate_AllowDarkModeForWindowWithTelemetryId(const BYTE* functionPtr)
 	}
 
 	return FALSE;
-#elif defined(_M_ARM64)
-	/* No implementation needed for Windows 11 on Arm64 */
-	functionPtr; /* to prevent: warning C4100: 'functionPtr': unreferenced formal parameter */
-	return TRUE;
 #else
 	#error Unsupported processor type
 #endif
@@ -227,10 +219,6 @@ BOOL Validate_SetPreferredAppMode(const BYTE* functionPtr)
 		(functionPtr[0x00] == 0x8B) && (functionPtr[0x01] == 0x05) &&   // mov     eax,dword ptr [uxtheme!g_preferredAppMode]
 		(functionPtr[0x06] == 0x87) && (functionPtr[0x07] == 0x0D) &&   // xchg    ecx,dword ptr [uxtheme!g_preferredAppMode]
 		(functionPtr[0x0C] == 0xC3);                                    // ret
-#elif defined(_M_ARM64)
-	/* No implementation needed for Windows 11 on Arm64 */
-	functionPtr; /* to prevent: warning C4100: 'functionPtr': unreferenced formal parameter */
-	return TRUE;
 #else
 	#error Unsupported processor type
 #endif