diff --git a/Modules/_ctypes/_ctypes.c b/Modules/_ctypes/_ctypes.c
index 3f19cc4..a62b716 100644
--- a/Modules/_ctypes/_ctypes.c
+++ b/Modules/_ctypes/_ctypes.c
@@ -444,7 +444,7 @@
 
 	if (offset < 0) {
 		PyErr_SetString(PyExc_ValueError,
-				"offset cannit be negative");
+				"offset cannot be negative");
 		return NULL;
 	}
 	if (dict->size > buffer_len - offset) {
@@ -500,7 +500,7 @@
 
 	if (offset < 0) {
 		PyErr_SetString(PyExc_ValueError,
-				"offset cannit be negative");
+				"offset cannot be negative");
 		return NULL;
 	}