diff --git a/src/hlib/stdio.c b/src/hlib/stdio.c
index e717154..c9301fd 100644
--- a/src/hlib/stdio.c
+++ b/src/hlib/stdio.c
@@ -161,6 +161,7 @@
         *write = format[i];
         write++;
     }
+    *write = 0;
 }
 
 void sprintf(char *data, const char *format, ...) {

diff --git a/src/hlib/stdio.c b/src/hlib/stdio.c
index e717154..c9301fd 100644
--- a/src/hlib/stdio.c
+++ b/src/hlib/stdio.c
@@ -161,6 +161,7 @@
         *write = format[i];
         write++;
     }
+    *write = 0;
 }
 
 void sprintf(char *data, const char *format, ...) {
diff --git a/src/include/hlib.h b/src/include/hlib.h
index 51cbcea..4ba8e13 100644
--- a/src/include/hlib.h
+++ b/src/include/hlib.h
@@ -103,7 +103,7 @@
 
 extern void _printf(AllocationData, const char *format, ...);
 extern char *_asprintf(AllocationData, const char *format, ...);
-extern void sprintf(const char *format, ...);
+extern void sprintf(char *data, const char *format, ...);
 #define printf(...) _printf(allocationData, __VA_ARGS__)
 #define asprintf(...) _asprintf(allocationData, __VA_ARGS__)