diff --git a/libc/string/memcpy.c b/libc/string/memcpy.c
index 4cd4a80..dea78b2 100644
--- a/libc/string/memcpy.c
+++ b/libc/string/memcpy.c
@@ -25,5 +25,5 @@
  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */
-#define MEM_COPY
+#define MEMCOPY
 #include "bcopy.c"