diff --git a/lib/cmetrics/src/cmt_encode_prometheus.c b/lib/cmetrics/src/cmt_encode_prometheus.c
index b5f76149c75..8e3bfd07531 100644
--- a/lib/cmetrics/src/cmt_encode_prometheus.c
+++ b/lib/cmetrics/src/cmt_encode_prometheus.c
@@ -373,7 +373,11 @@ static cfl_sds_t bucket_value_to_string(double val)
     len = snprintf(str, 64, "%g", val);
     cfl_sds_len_set(str, len);
 
-    if (!strchr(str, '.')) {
+    /*
+     * Append .0 only when there is no decimal point and the number
+     * is not in scientific notation.
+     */
+    if (!strchr(str, '.') && !strchr(str, 'e')) {
         cfl_sds_cat_safe(&str, ".0", 2);
     }