diff --git a/ping_common.c b/ping_common.c
index 0342e1a..1ab380c 100644
--- a/ping_common.c
+++ b/ping_common.c
@@ -271,6 +271,21 @@ void common_options(int ch)
 		errno = 0;
 		dbl = strtod(optarg, &ep);
 
+		if (errno || *ep != '\0') {
+			char *saved_locale;
+			int saved_errno;
+			saved_locale = strdup(setlocale(LC_NUMERIC, NULL));
+			setlocale(LC_NUMERIC, "C");
+
+			errno = 0;
+			dbl = strtod(optarg, &ep);
+			saved_errno = errno;
+
+			setlocale(LC_NUMERIC, saved_locale);
+			free(saved_locale);
+			errno = saved_errno;
+		}
+
 		if (errno || *ep != '\0' ||
 		    !finite(dbl) || dbl < 0.0 || dbl >= (double)INT_MAX / 1000 - 1.0) {
 			fprintf(stderr, "ping: bad timing interval\n");