diff --git a/python-rasterio.spec b/python-rasterio.spec
index 19a1a97..c9ee16b 100644
--- a/python-rasterio.spec
+++ b/python-rasterio.spec
@@ -43,6 +43,7 @@ BuildRequires:  python2-click-plugins
 BuildRequires:  python2-cligj >= 0.4
 BuildRequires:  python2-numpy
 BuildRequires:  python2-snuggs >= 1.4.1
+BuildRequires:  python2-mock
 
 Requires:       python2-enum34
 Requires:       python2-affine