diff --git a/include/macros.h b/include/macros.h
index fbb9492..9c195a6 100644
--- a/include/macros.h
+++ b/include/macros.h
@@ -8,7 +8,7 @@
 /* Human-readable sizes */
 #define KIB 1024
 #define MIB (1024 * KIB)
-#define GIB (1024 * GIB)
+#define GIB (1024 * MIB)
 
 /* Rounding */
 #define IS_ROUND(x, k) (!((x) & ((k) - 1)))