diff --git a/miniz.h b/miniz.h
index 754bc5a..f897e17 100644
--- a/miniz.h
+++ b/miniz.h
@@ -220,7 +220,7 @@ enum
 #define MZ_DEFLATED 8
 
 /* Heap allocation callbacks.
-Note that mz_alloc_func parameter types purpsosely differ from zlib's: items/size is size_t, not unsigned long. */
+Note that mz_alloc_func parameter types purposely differ from zlib's: items/size is size_t, not unsigned long. */
 typedef void *(*mz_alloc_func)(void *opaque, size_t items, size_t size);
 typedef void (*mz_free_func)(void *opaque, void *address);
 typedef void *(*mz_realloc_func)(void *opaque, void *address, size_t items, size_t size);