diff --git a/src/address_parser_train.c b/src/address_parser_train.c
index fd2ef3fd..3a1d22de 100644
--- a/src/address_parser_train.c
+++ b/src/address_parser_train.c
@@ -662,7 +662,7 @@ address_parser_t *address_parser_init(char *filename) {
 
     }
 
-    log_info("Done with vocab, total size=%zu\n", kh_size(vocab));
+    log_info("Done with vocab, total size=%" PRIkh32 "\n", kh_size(vocab));
 
     for (k = kh_begin(vocab); k != kh_end(vocab); ++k) {
         token = (char *)kh_key(vocab, k);
@@ -676,7 +676,7 @@ address_parser_t *address_parser_init(char *filename) {
         }
     }
 
-    log_info("After pruning vocab size=%zu\n", kh_size(vocab));
+    log_info("After pruning vocab size=%" PRIkh32 "\n", kh_size(vocab));
 
 
     log_info("Creating phrases trie\n");
diff --git a/src/klib/khash.h b/src/klib/khash.h
index e4e25fa5..554eb85d 100644
--- a/src/klib/khash.h
+++ b/src/klib/khash.h
@@ -101,14 +101,18 @@ int main() {
 
 #if UINT_MAX == 0xffffffffu
 typedef unsigned int khint32_t;
+#define PRIkh32 "u"
 #elif ULONG_MAX == 0xffffffffu
 typedef unsigned long khint32_t;
+#define PRIkh32 "lu"
 #endif
 
 #if ULONG_MAX == ULLONG_MAX
 typedef unsigned long khint64_t;
+#define PRIkh64 "lu"
 #else
 typedef unsigned long long khint64_t;
+#define PRIkh64 "llu"
 #endif
 
 #ifndef kh_inline