Fix compiler warning.

Reported by Myriachan.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/host/buildvm_lib.c b/src/host/buildvm_lib.c
index 47195fd4..99b8ad3f 100644
--- a/src/host/buildvm_lib.c
+++ b/src/host/buildvm_lib.c
@@ -319,7 +319,8 @@ void emit_lib(BuildCtx *ctx)
       char *p;
       /* Simplistic pre-processor. Only handles top-level #if/#endif. */
       if (buf[0] == '#' && buf[1] == 'i' && buf[2] == 'f') {
-        int ok = 1, len = strlen(buf);
+        int ok = 1;
+        size_t len = strlen(buf);
         if (buf[len-1] == '\n') {
           buf[len-1] = 0;
           if (buf[len-2] == '\r') {