diff --git a/c-programming/strings/str_replace.c b/c-programming/strings/str_replace.c
index a663e6b..8db64e0 100644
--- a/c-programming/strings/str_replace.c
+++ b/c-programming/strings/str_replace.c
@@ -28,7 +28,7 @@ char* str_replace(
 
 	// count the number of occurrences of the substring
 	for (; (p = strstr(p, substr)) != NULL; count++) {
-		if (max_count >= 0 && count >= (size_t) max_count)
+		if (max_count > 0 && count >= (size_t) max_count)
 			break;
 		p += substr_len;
 	}
@@ -66,7 +66,7 @@ int main(void) {
 	          * replacement1 = "universe",
 	          * replacement2 = "_____";
 
-	char* result1 = str_replace(str, substr, replacement1, -1),
+	char* result1 = str_replace(str, substr, replacement1, STR_REPLACE_ALL),
 	    * result2 = str_replace(str, substr, replacement2, 1);
 
 	puts(result1); free(result1);
diff --git a/c-programming/strings/str_replace.h b/c-programming/strings/str_replace.h
index a7fde95..a372ac3 100644
--- a/c-programming/strings/str_replace.h
+++ b/c-programming/strings/str_replace.h
@@ -8,6 +8,8 @@
 #include <stdlib.h>
 #include <string.h>
 
+#define STR_REPLACE_ALL 0
+
 char* str_replace(
   const char* str,
   const char* substr,