diff --git a/srcpkgs/eigen/template b/srcpkgs/eigen/template
index ee825e95f27..072228c1691 100644
--- a/srcpkgs/eigen/template
+++ b/srcpkgs/eigen/template
@@ -3,6 +3,7 @@ pkgname=eigen
 version=3.3.9
 revision=1
 build_style=cmake
+configure_args="-DCMAKE_BUILD_TYPE=Release"
 short_desc="C++ template library for linear algebra (version 3.x)"
 maintainer="Orphaned <orphan@voidlinux.org>"
 license="MPL-2.0, GPL-3.0-or-later, LGPL-2.1-or-later, BSD-3-Clause"
diff --git a/srcpkgs/eigen3.2/template b/srcpkgs/eigen3.2/template
index 5715fc1b3a1..7b710534b5e 100644
--- a/srcpkgs/eigen3.2/template
+++ b/srcpkgs/eigen3.2/template
@@ -4,6 +4,7 @@ version=3.2.10
 revision=3
 wrksrc="eigen-${version}"
 build_style=cmake
+configure_args="-DCMAKE_BUILD_TYPE=Release"
 short_desc="C++ template library for linear algebra (version 3.x)"
 maintainer="Orphaned <orphan@voidlinux.org>"
 license="MPL-2.0, GPL-3.0-or-later, LGPL-2.1-or-later, BSD-3-Clause"