diff --git a/src/cpu.zig b/src/cpu.zig
index d249c3e..e0e2ed5 100644
--- a/src/cpu.zig
+++ b/src/cpu.zig
@@ -449,7 +449,7 @@ pub const Arm7tdmi = struct {
         const r12 = self.r[12];
         const r13 = self.r[13];
         const r14 = self.r[14];
-        const r15 = self.r[15] -| if (self.cpsr.t.read()) 4 else @as(u32, 8);
+        const r15 = self.r[15] -| if (self.cpsr.t.read()) 2 else @as(u32, 4);
 
         const c_psr = self.cpsr.raw;