diff --git a/src/core/corelib.c b/src/core/corelib.c
index a6c69dec..9de58134 100644
--- a/src/core/corelib.c
+++ b/src/core/corelib.c
@@ -144,10 +144,12 @@ static Janet janet_core_expand_path(int32_t argc, Janet *argv) {
                 janet_buffer_push_cstring(out, input);
                 i += 4;
             } else if (strncmp(template + i, ":cur:", 5) == 0) {
-                janet_buffer_push_bytes(out, (const uint8_t *) curfile, curname - curfile);
+                janet_buffer_push_bytes(out, (const uint8_t *) curfile,
+                        (int32_t)(curname - curfile));
                 i += 4;
             } else if (strncmp(template + i, ":dir:", 5) == 0) {
-                janet_buffer_push_bytes(out, (const uint8_t *) input, name - input);
+                janet_buffer_push_bytes(out, (const uint8_t *) input,
+                        (int32_t)(name - input));
                 i += 4;
             } else if (strncmp(template + i, ":sys:", 5) == 0) {
                 janet_buffer_push_cstring(out, syspath);
@@ -209,7 +211,7 @@ static Janet janet_core_expand_path(int32_t argc, Janet *argv) {
         }
         scan++;
     }
-    out->count = print - out->data;
+    out->count = (int32_t)(print - out->data);
     return janet_wrap_buffer(out);
 }
 
diff --git a/src/core/peg.c b/src/core/peg.c
index fe06a722..17555866 100644
--- a/src/core/peg.c
+++ b/src/core/peg.c
@@ -1002,7 +1002,7 @@ static void peg_unmarshal(void *p, JanetMarshalContext *ctx) {
      * need to a depth first traversal. It is stricter
      * than a dfs by not allowing certain kinds of unused
      * bytecode. */
-    uint32_t blen = peg->bytecode_len;
+    uint32_t blen = (int32_t) peg->bytecode_len;
     uint32_t clen = peg->num_constants;
     uint8_t *op_flags = calloc(1, blen);
     if (NULL == op_flags) {