diff --git a/utest.h b/utest.h
index a981162..3ce307d 100644
--- a/utest.h
+++ b/utest.h
@@ -60,6 +60,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <errno.h>
+#include <math.h>
 
 #if defined(_MSC_VER)
 #pragma warning(pop)
@@ -1169,7 +1170,7 @@
 
     // print timing info
     if (iterations) {
-      printf("(mean %" UTEST_PRId64 "ns, between %lld to %lld, stddev %f, confidence interval +- %f%%)",
+      printf("(mean %" UTEST_PRId64 "ns, between %" UTEST_PRId64 " to %" UTEST_PRId64 ", stddev %f, confidence interval +- %f%%)",
           best_avg_ns, min_ns, max_ns, best_deviation, best_confidence);
     } else {
       printf("(%" UTEST_PRId64 "ns)", ns);
@@ -1210,7 +1211,8 @@
         fprintf(utest_state.output, "    <testcase name=\"%s\" status=\"run\" result=\"completed\" time=\"%" UTEST_PRId64 "ns\"",
             utest_state.tests[index].name, utest_state.tests[index].ns);
         if (utest_state.tests[index].iterations) {
-          fprintf(utest_state.output, " avg_time=\"%" UTEST_PRId64 "ns\" lowest_time=\"%lldns\" highest_time=\"%lldns\" std_deviation=\"%f\" confidence_interval=\"+-%f%%\"",
+          fprintf(utest_state.output, " avg_time=\"%" UTEST_PRId64 "ns\" lowest_time=\"%" UTEST_PRId64 "ns\" highest_time=\"%"
+              UTEST_PRId64 "ns\" std_deviation=\"%f\" confidence_interval=\"+-%f%%\"",
               utest_state.tests[index].best_avg_ns, utest_state.tests[index].min_ns, utest_state.tests[index].max_ns,
               utest_state.tests[index].best_deviation, utest_state.tests[index].best_confidence);
         }