diff --git a/sci-libs/nlopt/nlopt-2.7.1-r1.ebuild b/sci-libs/nlopt/nlopt-2.7.1-r1.ebuild
index 5adc753ba9217..5380513673476 100644
--- a/sci-libs/nlopt/nlopt-2.7.1-r1.ebuild
+++ b/sci-libs/nlopt/nlopt-2.7.1-r1.ebuild
@@ -4,6 +4,7 @@
 EAPI=8
 
 PYTHON_COMPAT=( python3_{9..10} )
+FORTRAN_NEEDED="test"
 
 inherit python-r1 cmake fortran-2
 
diff --git a/sci-libs/nlopt/nlopt-2.7.1-r2.ebuild b/sci-libs/nlopt/nlopt-2.7.1-r2.ebuild
index 67b4245b98097..8c79360511935 100644
--- a/sci-libs/nlopt/nlopt-2.7.1-r2.ebuild
+++ b/sci-libs/nlopt/nlopt-2.7.1-r2.ebuild
@@ -4,6 +4,7 @@
 EAPI=8
 
 PYTHON_COMPAT=( python3_{9..11} )
+FORTRAN_NEEDED="test"
 
 inherit python-r1 cmake fortran-2