diff --git a/src/format.c b/src/format.c
index 92a9c93..6b52860 100644
--- a/src/format.c
+++ b/src/format.c
@@ -107,7 +107,7 @@ bool
 apfl_format_put_number(struct apfl_format_writer w, apfl_number number)
 {
     char buf[PUT_NUMBER_BUFSIZE];
-    size_t len = snprintf(buf, PUT_NUMBER_BUFSIZE, "%f", number);
+    size_t len = snprintf(buf, PUT_NUMBER_BUFSIZE, "%.12G", number);
     TRY(write(w, buf, len));
     if (len >= PUT_NUMBER_BUFSIZE) {
         TRY(apfl_format_put_string(w, "[...]"));