diff --git a/src/expand.cpp b/src/expand.cpp
index 4bb30bdd4..664e2d4e5 100644
--- a/src/expand.cpp
+++ b/src/expand.cpp
@@ -166,7 +166,7 @@ wcstring expand_escape_variable(const wcstring &in) {
 
     tokenize_variable_array(in, lst);
 
-    int size = lst.size();
+    size_t size = lst.size();
     if (size == 0) {
         buff.append(L"''");
     } else if (size == 1) {
diff --git a/src/reader.cpp b/src/reader.cpp
index f3886668a..0ba539ce3 100644
--- a/src/reader.cpp
+++ b/src/reader.cpp
@@ -1375,7 +1375,7 @@ static bool handle_completions(const std::vector<completion_t> &comp,
     const wcstring tok(begin, end - begin);
 
     // Check trivial cases.
-    int size = comp.size();
+    size_t size = comp.size();
     if (size == 0) {
         // No suitable completions found, flash screen and return.
         reader_flash();