diff --git a/cpu/decoder.cpp b/cpu/decoder.cpp
index 01c45a3..010b7b2 100644
--- a/cpu/decoder.cpp
+++ b/cpu/decoder.cpp
@@ -288,10 +288,8 @@ void Cpu::executeInstruction()
           state.PC = state.HL;
           break;
         case 0x18: // JR e
-          {
-            s8 e = readPC8();
-            state.PC += e;
-          }
+          state.PC += (s8)readPC8();
+          break;
         case 0xCD: // CALL nn
           doCall(readPC16()); mcycles = 6; break;
         case 0xC9: // RET