diff --git a/Compiler/src/BytecodeBuilder.cpp b/Compiler/src/BytecodeBuilder.cpp
index 2d31c40..e6d0245 100644
--- a/Compiler/src/BytecodeBuilder.cpp
+++ b/Compiler/src/BytecodeBuilder.cpp
@@ -714,7 +714,7 @@ void BytecodeBuilder::writeLineInfo(std::string& ss) const
     // third pass: write resulting data
     int logspan = log2(span);
 
-    writeByte(ss, logspan);
+    writeByte(ss, uint8_t(logspan));
 
     uint8_t lastOffset = 0;
 
@@ -723,8 +723,8 @@ void BytecodeBuilder::writeLineInfo(std::string& ss) const
         int delta = lines[i] - baseline[i >> logspan];
         LUAU_ASSERT(delta >= 0 && delta <= 255);
 
-        writeByte(ss, delta - lastOffset);
-        lastOffset = delta;
+        writeByte(ss, uint8_t(delta) - lastOffset);
+        lastOffset = uint8_t(delta);
     }
 
     int lastLine = 0;
diff --git a/Compiler/src/Compiler.cpp b/Compiler/src/Compiler.cpp
index 6ae4902..0156fcf 100644
--- a/Compiler/src/Compiler.cpp
+++ b/Compiler/src/Compiler.cpp
@@ -364,12 +364,12 @@ struct Compiler
                     else
                     {
                         args[i] = uint8_t(regs + 1 + i);
-                        compileExprTempTop(expr->args.data[i], args[i]);
+                        compileExprTempTop(expr->args.data[i], uint8_t(args[i]));
                     }
                 }
 
                 fastcallLabel = bytecode.emitLabel();
-                bytecode.emitABC(opc, uint8_t(bfid), args[0], 0);
+                bytecode.emitABC(opc, uint8_t(bfid), uint8_t(args[0]), 0);
                 if (opc != LOP_FASTCALL1)
                     bytecode.emitAux(args[1]);
 
@@ -385,7 +385,7 @@ struct Compiler
                     }
 
                     if (args[i] != regs + 1 + i)
-                        bytecode.emitABC(LOP_MOVE, uint8_t(regs + 1 + i), args[i], 0);
+                        bytecode.emitABC(LOP_MOVE, uint8_t(regs + 1 + i), uint8_t(args[i]), 0);
                 }
             }
             else
@@ -471,7 +471,7 @@ struct Compiler
 
             if (cid >= 0 && cid < 32768)
             {
-                bytecode.emitAD(LOP_DUPCLOSURE, target, cid);
+                bytecode.emitAD(LOP_DUPCLOSURE, target, int16_t(cid));
                 shared = true;
             }
         }
@@ -493,7 +493,7 @@ struct Compiler
                 // get local variable
                 uint8_t reg = getLocal(uv);
 
-                bytecode.emitABC(LOP_CAPTURE, immutable ? LCT_VAL : LCT_REF, reg, 0);
+                bytecode.emitABC(LOP_CAPTURE, uint8_t(immutable ? LCT_VAL : LCT_REF), reg, 0);
             }
             else
             {
@@ -635,7 +635,7 @@ struct Compiler
 
         if (expr->op == AstExprBinary::CompareGt || expr->op == AstExprBinary::CompareGe)
         {
-            bytecode.emitAD(opc, rr, 0);
+            bytecode.emitAD(opc, uint8_t(rr), 0);
             bytecode.emitAux(rl);
         }
         else
@@ -1144,7 +1144,7 @@ struct Compiler
             }
             else
             {
-                bytecode.emitABC(LOP_NEWTABLE, reg, encodedHashSize, 0);
+                bytecode.emitABC(LOP_NEWTABLE, reg, uint8_t(encodedHashSize), 0);
                 bytecode.emitAux(0);
             }
         }
@@ -1157,7 +1157,7 @@ struct Compiler
             bool trailingVarargs = last && last->kind == AstExprTable::Item::List && last->value->is<AstExprVarargs>();
             LUAU_ASSERT(!trailingVarargs || arraySize > 0);
 
-            bytecode.emitABC(LOP_NEWTABLE, reg, encodedHashSize, 0);
+            bytecode.emitABC(LOP_NEWTABLE, reg, uint8_t(encodedHashSize), 0);
             bytecode.emitAux(arraySize - trailingVarargs + indexSize);
         }