diff --git a/include/r3_str.h b/include/r3_str.h
index 454ae8e..8da66fa 100644
--- a/include/r3_str.h
+++ b/include/r3_str.h
@@ -10,10 +10,6 @@
 #include "r3_define.h"
 #include "config.h"
 
-int strndiff(char * d1, char * d2, unsigned int n);
-
-int strdiff(char * d1, char * d2);
-
 int slug_count(char * p, int len);
 
 char * compile_slug(char * str, int len);
diff --git a/src/node.c b/src/node.c
index c592021..e278e1f 100644
--- a/src/node.c
+++ b/src/node.c
@@ -18,9 +18,28 @@
 #include "r3.h"
 #include "str_array.h"
 
-
 // String value as the index http://judy.sourceforge.net/doc/JudySL_3x.htm
 
+
+static int strndiff(char * d1, char * d2, unsigned int n) {
+    char * o = d1;
+    while ( *d1 == *d2 && n-- > 0 ) { 
+        d1++;
+        d2++;
+    }
+    return d1 - o;
+}
+
+static int strdiff(char * d1, char * d2) {
+    char * o = d1;
+    while( *d1 == *d2 ) { 
+        d1++;
+        d2++;
+    }
+    return d1 - o;
+}
+
+
 /**
  * Create a node object
  */
diff --git a/src/str.c b/src/str.c
index 124e1d2..814a012 100644
--- a/src/str.c
+++ b/src/str.c
@@ -12,26 +12,6 @@
 #include "str_array.h"
 #include "r3_define.h"
 
-int strndiff(char * d1, char * d2, unsigned int n) {
-    char * o = d1;
-    while ( *d1 == *d2 && n-- > 0 ) { 
-        d1++;
-        d2++;
-    }
-    return d1 - o;
-}
-
-
-int strdiff(char * d1, char * d2) {
-    char * o = d1;
-    while( *d1 == *d2 ) { 
-        d1++;
-        d2++;
-    }
-    return d1 - o;
-}
-
-
 /**
  * provide a quick way to count slugs, simply search for '{'
  */
diff --git a/tests/bench_str.csv b/tests/bench_str.csv
index ab5cfe9..f06c833 100644
--- a/tests/bench_str.csv
+++ b/tests/bench_str.csv
@@ -384,3 +384,4 @@
 1400593197,13978543.79
 1400593210,13568445.16
 1400593219,13704926.07
+1400599508,13991454.07