diff --git a/examples/ptb.cpp b/examples/ptb.cpp
index aae5225b60..1674351582 100644
--- a/examples/ptb.cpp
+++ b/examples/ptb.cpp
@@ -100,7 +100,7 @@ unsigned loadPTB(Tensor &inputWords, Tensor &targetWords, size_t numSteps,
 
 void debug(Node *node) {
   std::cout << (std::string)node->getName();
-  for (int i = 0; i < node->dims().size(); i++) {
+  for (size_t i = 0; i < node->dims().size(); i++) {
     std::cout << " " << node->dims()[i];
   }
   std::cout << std::endl;
@@ -239,7 +239,7 @@ void testPTB() {
 
   std::cout << "Training for " << numBatches << " rounds" << std::endl;
 
-  for (int iter = 0; iter < numEpochs; iter++) {
+  for (size_t iter = 0; iter < numEpochs; iter++) {
     std::cout << "Training - iteration #" << (iter + 1) << std::endl;
 
     llvm::Timer timer("Training", "Training");
diff --git a/src/glow/Graph/Graph.cpp b/src/glow/Graph/Graph.cpp
index 1033b633d3..9b47fc3987 100644
--- a/src/glow/Graph/Graph.cpp
+++ b/src/glow/Graph/Graph.cpp
@@ -375,8 +375,8 @@ BatchedMatMulNode *Graph::createBatchedMatMul(llvm::StringRef name,
   size_t b1 = RDims[1];
   size_t b2 = RDims[2];
 
-  assert(a0 == 1 || b0 == 1 ||
-         a0 == b0 && "Batch size must be broadcasted or identical");
+  assert(((a0 == 1) || (b0 == 1) || (a0 == b0)) &&
+         "Batch size must be broadcasted or identical");
 
   // Select the batch size. If the left operand is broadcast (value 1), select
   // the RHS.
diff --git a/src/glow/IR/Instrs.cpp b/src/glow/IR/Instrs.cpp
index 4bd8db55bd..175967656e 100644
--- a/src/glow/IR/Instrs.cpp
+++ b/src/glow/IR/Instrs.cpp
@@ -172,8 +172,8 @@ void BatchedMatMulInst::verify() const {
   size_t c1 = DDims[1];
   size_t c2 = DDims[2];
 
-  assert(a0 == 1 || b0 == 1 ||
-         a0 == b0 && "Batch size must be broadcasted or identical");
+  assert(((a0 == 1) || (b0 == 1) || (a0 == b0)) &&
+         "Batch size must be broadcasted or identical");
 
   // Select the batch size. If the left operand is broadcast (value 1), select
   // the RHS.
diff --git a/src/glow/Optimizer/GraphOptimizer.cpp b/src/glow/Optimizer/GraphOptimizer.cpp
index fcedcb3695..7e01b99634 100644
--- a/src/glow/Optimizer/GraphOptimizer.cpp
+++ b/src/glow/Optimizer/GraphOptimizer.cpp
@@ -496,7 +496,7 @@ struct CSEVisitor : NodeWalker {
     // Replace current node by a found node, which is
     // equivalent to it.
     assert(N->isEqual(*FoundN));
-    for (int i = 0; i < N->getNumRes(); i++) {
+    for (unsigned i = 0; i < N->getNumRes(); i++) {
       NodeValue FV(FoundN, i);
       NodeValue(N, i).replaceAllUsesOfWith(FV);
     }