diff --git a/Modules/mmapmodule.c b/Modules/mmapmodule.c
index 5532c44..2ae52c7 100644
--- a/Modules/mmapmodule.c
+++ b/Modules/mmapmodule.c
@@ -1114,7 +1114,7 @@
         return NULL;
     if (map_size < 0) {
         PyErr_SetString(PyExc_OverflowError,
-                        "memory mapped length must be postiive");
+                        "memory mapped length must be positive");
         return NULL;
     }
     if (offset < 0) {
@@ -1300,7 +1300,7 @@
 
     if (map_size < 0) {
         PyErr_SetString(PyExc_OverflowError,
-                        "memory mapped length must be postiive");
+                        "memory mapped length must be positive");
         return NULL;
     }
     if (offset < 0) {