diff --git a/Dapper/SqlMapper.cs b/Dapper/SqlMapper.cs
index 9aba90d30736a3d545e69986cd5c93c3429b4d5c..85af6f7a9a7845f22d1c6aca547f47abc9ac358b 100644
--- a/Dapper/SqlMapper.cs
+++ b/Dapper/SqlMapper.cs
@@ -1010,7 +1010,16 @@ private static void EmitInt32(ILGenerator il, int value)
                 case 6: il.Emit(OpCodes.Ldc_I4_6); break;
                 case 7: il.Emit(OpCodes.Ldc_I4_7); break;
                 case 8: il.Emit(OpCodes.Ldc_I4_8); break;
-                default: il.Emit(value >= -128 && value <= 127 ? OpCodes.Ldc_I4_S: OpCodes.Ldc_I4, value); break;
+                default:
+                    if (value >= -128 && value <= 127)
+                    {
+                        il.Emit(OpCodes.Ldc_I4_S, (sbyte)value);
+                    }
+                    else
+                    {
+                        il.Emit(OpCodes.Ldc_I4, value);
+                    }
+                    break;
             }
         }