diff --git a/src/common.c b/src/common.c
index 2af642e..1da1c45 100644
--- a/src/common.c
+++ b/src/common.c
@@ -23,6 +23,33 @@ const char *proxy_state_strmap[] = {
     "busy",
 };
 
+/* isnumericipv4() taken from libulz */
+int pc_isnumericipv4(const char* ipstring) {
+	size_t x = 0, n = 0, d = 0;
+	int wasdot = 0;
+	while(1) {
+		switch(ipstring[x]) {
+			case 0: goto done;
+			case '.':
+				if(!n || wasdot) return 0;
+				d++;
+				wasdot = 1;
+				break;
+			case '0': case '1': case '2': case '3': case '4':
+			case '5': case '6': case '7': case '8': case '9':
+				n++;
+				wasdot = 0;
+				break;
+			default:
+				return 0;
+		}
+		x++;
+	}
+	done:
+	if(d == 3 && n >= 4 && n <= 12) return 1;
+	return 0;
+}
+
 // stolen from libulz (C) rofl0r
 void pc_stringfromipv4(unsigned char *ip_buf_4_bytes, char *outbuf_16_bytes) {
 	unsigned char *p;
diff --git a/src/common.h b/src/common.h
index 5335bd1..91468bc 100644
--- a/src/common.h
+++ b/src/common.h
@@ -17,6 +17,7 @@ extern const char *proxy_state_strmap[];
 
 char *get_config_path(char* default_path, char* pbuf, size_t bufsize);
 void pc_stringfromipv4(unsigned char *ip_buf_4_bytes, char *outbuf_16_bytes);
+int pc_isnumericipv4(const char* ipstring);
 
 //RcB: DEP "common.c"
 #endif
diff --git a/src/hostsreader.c b/src/hostsreader.c
index 86aeb3c..42e5323 100644
--- a/src/hostsreader.c
+++ b/src/hostsreader.c
@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include <ctype.h>
 #include <string.h>
+#include "common.h"
 
 /*
    simple reader for /etc/hosts
@@ -24,7 +25,6 @@ void hostsreader_close(struct hostsreader *ctx) {
 	fclose(ctx->f);
 }
 
-static int isnumericipv4(const char* ipstring);
 int hostsreader_get(struct hostsreader *ctx, char* buf, size_t bufsize) {
 	while(1) {
 		if(!fgets(buf, bufsize, ctx->f)) return 0;
@@ -51,7 +51,7 @@ int hostsreader_get(struct hostsreader *ctx, char* buf, size_t bufsize) {
 		}
 		if(!l || !*p) continue;
 		*p = 0;
-		if(isnumericipv4(ctx->ip)) return 1;
+		if(pc_isnumericipv4(ctx->ip)) return 1;
 	}
 }
 
@@ -94,30 +94,3 @@ int main(int a, char**b) {
 	printf("%s\n", ret ? ret : "null");
 }
 #endif
-
-/* isnumericipv4() taken from libulz */
-static int isnumericipv4(const char* ipstring) {
-	size_t x = 0, n = 0, d = 0;
-	int wasdot = 0;
-	while(1) {
-		switch(ipstring[x]) {
-			case 0: goto done;
-			case '.':
-				if(!n || wasdot) return 0;
-				d++;
-				wasdot = 1;
-				break;
-			case '0': case '1': case '2': case '3': case '4':
-			case '5': case '6': case '7': case '8': case '9':
-				n++;
-				wasdot = 0;
-				break;
-			default:
-				return 0;
-		}
-		x++;
-	}
-	done:
-	if(d == 3 && n >= 4 && n <= 12) return 1;
-	return 0;
-}