diff --git a/a2sudoku.xcodeproj/project.xcworkspace/xcuserdata/jrand.xcuserdatad/UserInterfaceState.xcuserstate b/a2sudoku.xcodeproj/project.xcworkspace/xcuserdata/jrand.xcuserdatad/UserInterfaceState.xcuserstate
index c4ee5a2..0a49fc5 100644
Binary files a/a2sudoku.xcodeproj/project.xcworkspace/xcuserdata/jrand.xcuserdatad/UserInterfaceState.xcuserstate and b/a2sudoku.xcodeproj/project.xcworkspace/xcuserdata/jrand.xcuserdatad/UserInterfaceState.xcuserstate differ
diff --git a/a2sudoku/make/V2Make.scpt b/a2sudoku/make/V2Make.scpt
index 7610b9c..8c3d080 100644
Binary files a/a2sudoku/make/V2Make.scpt and b/a2sudoku/make/V2Make.scpt differ
diff --git a/a2sudoku/puzzles.c b/a2sudoku/puzzles.c
index a2b0931..8cc083c 100644
--- a/a2sudoku/puzzles.c
+++ b/a2sudoku/puzzles.c
@@ -50,7 +50,7 @@ tPuzzle thePuzzle;
 void fileReadProblem(char *filename)
 {
     clrscr();
-    asm ("STA %w", 0xc051);
+    asm volatile ("STA %w", 0xc051);
     printf("\n\nUnable to read file %s\nPress any key to quit", filename);
     cgetc();
     exit(0);
diff --git a/a2sudoku/ui.c b/a2sudoku/ui.c
index 2ee60ca..b05097e 100644
--- a/a2sudoku/ui.c
+++ b/a2sudoku/ui.c
@@ -201,13 +201,13 @@ void shutdownUI(void)
 void textMode(void)
 {
     clrscr();
-    asm ("STA %w", 0xc051);
+    asm volatile ("STA %w", 0xc051);
 }
 
 
 void graphicsMode(void)
 {
-    asm ("STA %w", 0xc050);
+    asm volatile ("STA %w", 0xc050);
 }