diff --git a/include/r3_str.h b/include/r3_str.h
index 9750cd1..e167f24 100644
--- a/include/r3_str.h
+++ b/include/r3_str.h
@@ -30,7 +30,7 @@ void print_indent(int level);
 
 char *my_strdup(const char *s);
 
-char *my_strndup(const char *s, size_t n);
+char *my_strndup(const char *s, int n);
 
 
 #endif /* !STR_H */
diff --git a/src/str.c b/src/str.c
index 5d0caf8..02087dd 100644
--- a/src/str.c
+++ b/src/str.c
@@ -183,7 +183,7 @@ void print_indent(int level) {
 
 char *my_strdup(const char *s) {
     char *out;
-    size_t count = 0;
+    int count = 0;
     while( s[count] )
         ++count;
     ++count;
@@ -194,9 +194,9 @@ char *my_strdup(const char *s) {
     return out;
 }
 
-char *my_strndup(const char *s, size_t n) {
+char *my_strndup(const char *s, int n) {
     char *out;
-    size_t count = 0;
+    int count = 0;
     while( count < n && s[count] )
         ++count;
     ++count;