diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index aee7cdb..fbdca20 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,6 +1,6 @@
 name: CI
 
-on: 
+on:
   push:
     branches:
       - main
@@ -40,7 +40,7 @@ jobs:
         run: python3 -m pip install -r requirements.txt
 
       # Ideally we would use this but it seems to be broken
-      # - name: Setup wasm-tools 
+      # - name: Setup wasm-tools
       #   uses: jcbhmr/setup-wasm-tools@v2
       #   with:
       #     wasm-tools-version: 1.207
@@ -62,7 +62,7 @@ jobs:
 
       - name: Run mem64 test
         run: |
-          zig build test-mem64
+          zig build -Doptimize=ReleaseSafe test-mem64
 
       - name: Run wasi testsuite
         run: |
diff --git a/src/vm_stack.zig b/src/vm_stack.zig
index 154cea6..9c957d8 100644
--- a/src/vm_stack.zig
+++ b/src/vm_stack.zig
@@ -854,7 +854,6 @@ const InstructionFuncs = struct {
     };
 
     fn run(pc: u32, code: [*]const Instruction, stack: *Stack) anyerror!void {
-        std.debug.print("Running code {any}\n", .{code[pc]});
         try @call(.always_tail, InstructionFuncs.lookup(code[pc].opcode), .{ pc, code, stack });
     }
 
@@ -2102,8 +2101,6 @@ const InstructionFuncs = struct {
             else => unreachable,
         };
 
-        std.debug.print("Growing from {} to {}", .{ old_num_pages, num_pages });
-
         if (num_pages >= 0 and memory_instance.grow(@as(usize, @intCast(num_pages)))) {
             stack.pushI32(old_num_pages);
             try @call(.always_tail, InstructionFuncs.lookup(code[pc + 1].opcode), .{ pc + 1, code, stack });