1 files changed, 1 insertions, 1 deletions
diff --git a/ndarray.h b/ndarray.h
index 9e1b8ba..42cb64f 100644
--- a/ndarray.h
+++ b/ndarray.h
@@ -25,7 +25,7 @@
 typedef struct Slice {
     ptrdiff_t start;
     ptrdiff_t end;
-    size_t    step;
+    ptrdiff_t step;
 } Slice;
 
 #define SLICE(start, end, step) ((Slice){ start, end, step })