diff --git a/bgpd/bgp_rd.c b/bgpd/bgp_rd.c
index 356a949d69..77f5aade5f 100644
--- a/bgpd/bgp_rd.c
+++ b/bgpd/bgp_rd.c
@@ -27,6 +27,7 @@
 #include "memory.h"
 #include "stream.h"
 #include "filter.h"
+#include "frrstr.h"
 
 #include "bgpd/bgpd.h"
 #include "bgpd/bgp_rd.h"
diff --git a/bgpd/bgp_routemap.c b/bgpd/bgp_routemap.c
index 9f3bec81d3..f7c79f873d 100644
--- a/bgpd/bgp_routemap.c
+++ b/bgpd/bgp_routemap.c
@@ -37,6 +37,7 @@
 #include "sockunion.h"
 #include "hash.h"
 #include "queue.h"
+#include "frrstr.h"
 
 #include "bgpd/bgpd.h"
 #include "bgpd/bgp_table.h"
diff --git a/bgpd/bgp_vty.c b/bgpd/bgp_vty.c
index f0fc3a89e9..4e0f7155ba 100644
--- a/bgpd/bgp_vty.c
+++ b/bgpd/bgp_vty.c
@@ -34,6 +34,7 @@
 #include "hash.h"
 #include "queue.h"
 #include "filter.h"
+#include "frrstr.h"
 
 #include "bgpd/bgpd.h"
 #include "bgpd/bgp_advertise.h"
diff --git a/lib/frrstr.c b/lib/frrstr.c
index 82c0ad7730..715e67b868 100644
--- a/lib/frrstr.c
+++ b/lib/frrstr.c
@@ -161,3 +161,11 @@ bool begins_with(const char *str, const char *prefix)
 
 	return strncmp(str, prefix, lenprefix) == 0;
 }
+
+int all_digit(const char *str)
+{
+	for (; *str != '\0'; str++)
+		if (!isdigit((int)*str))
+			return 0;
+	return 1;
+}
diff --git a/lib/frrstr.h b/lib/frrstr.h
index 2454771122..891a3f337c 100644
--- a/lib/frrstr.h
+++ b/lib/frrstr.h
@@ -97,4 +97,15 @@ void frrstr_strvec_free(vector v);
  */
 bool begins_with(const char *str, const char *prefix);
 
+/*
+ * Check the string only contains digit characters.
+ *
+ * str
+ *    string to check for digits
+ *
+ * Returns:
+ *    1 str only contains digit characters, 0 otherwise
+ */
+int all_digit(const char *str);
+
 #endif /* _FRRSTR_H_ */
diff --git a/lib/prefix.c b/lib/prefix.c
index b129665e7b..751f20cb83 100644
--- a/lib/prefix.c
+++ b/lib/prefix.c
@@ -1373,17 +1373,6 @@ void prefix_free(struct prefix *p)
 	XFREE(MTYPE_PREFIX, p);
 }
 
-/* Utility function.  Check the string only contains digit
- * character.
- * FIXME str.[c|h] would be better place for this function. */
-int all_digit(const char *str)
-{
-	for (; *str != '\0'; str++)
-		if (!isdigit((int)*str))
-			return 0;
-	return 1;
-}
-
 /* Utility function to convert ipv4 prefixes to Classful prefixes */
 void apply_classful_mask_ipv4(struct prefix_ipv4 *p)
 {
diff --git a/lib/prefix.h b/lib/prefix.h
index f5dbb22f79..4247569137 100644
--- a/lib/prefix.h
+++ b/lib/prefix.h
@@ -458,7 +458,6 @@ static inline int ipv6_martian(struct in6_addr *addr)
 	return 0;
 }
 
-extern int all_digit(const char *);
 extern int macstr2prefix_evpn(const char *str, struct prefix_evpn *p);
 
 /* NOTE: This routine expects the address argument in network byte order. */
diff --git a/ospfd/ospf_routemap.c b/ospfd/ospf_routemap.c
index ca711aa42f..f3271acfa2 100644
--- a/ospfd/ospf_routemap.c
+++ b/ospfd/ospf_routemap.c
@@ -32,6 +32,7 @@
 #include "log.h"
 #include "plist.h"
 #include "vrf.h"
+#include "frrstr.h"
 
 #include "ospfd/ospfd.h"
 #include "ospfd/ospf_asbr.h"
diff --git a/zebra/zebra_routemap.c b/zebra/zebra_routemap.c
index 6d3c2b2265..ce51f54a65 100644
--- a/zebra/zebra_routemap.c
+++ b/zebra/zebra_routemap.c
@@ -31,6 +31,7 @@
 #include "plist.h"
 #include "nexthop.h"
 #include "vrf.h"
+#include "frrstr.h"
 
 #include "zebra/zserv.h"
 #include "zebra/redistribute.h"