diff --git a/sci-libs/blas-reference/blas-reference-20151113-r1.ebuild b/sci-libs/blas-reference/blas-reference-20151113-r1.ebuild
index 4b97225136401..13f1edb36df58 100644
--- a/sci-libs/blas-reference/blas-reference-20151113-r1.ebuild
+++ b/sci-libs/blas-reference/blas-reference-20151113-r1.ebuild
@@ -2,6 +2,7 @@
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=6
+CMAKE_MAKEFILE_GENERATOR=emake
 
 inherit eutils fortran-2 cmake-utils multilib flag-o-matic toolchain-funcs
 
diff --git a/sci-libs/blas-reference/blas-reference-20161223.ebuild b/sci-libs/blas-reference/blas-reference-20161223.ebuild
index f9afcc3aec121..5ceb038e77020 100644
--- a/sci-libs/blas-reference/blas-reference-20161223.ebuild
+++ b/sci-libs/blas-reference/blas-reference-20161223.ebuild
@@ -2,6 +2,7 @@
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=6
+CMAKE_MAKEFILE_GENERATOR=emake
 
 inherit eutils fortran-2 cmake-utils multilib flag-o-matic toolchain-funcs