diff --git a/BUILDING.md b/BUILDING.md
index 75ef93f8c7..2dd5c14277 100644
--- a/BUILDING.md
+++ b/BUILDING.md
@@ -13,7 +13,7 @@ file a new issue.
 
 Prerequisites:
 
-* `gcc` and `g++` 4.8 or newer, or
+* `gcc` and `g++` 4.8.5 or newer, or
 * `clang` and `clang++` 3.4 or newer
 * Python 2.6 or 2.7
 * GNU Make 3.81 or newer