diff --git a/var/spack/repos/builtin/packages/gromacs/package.py b/var/spack/repos/builtin/packages/gromacs/package.py
index ea9af54c6cb..c8b440c912b 100644
--- a/var/spack/repos/builtin/packages/gromacs/package.py
+++ b/var/spack/repos/builtin/packages/gromacs/package.py
@@ -264,6 +264,7 @@ class Gromacs(CMakePackage, CudaPackage):
     depends_on("c", type="build")
     depends_on("cxx", type="build")
     depends_on("fortran", type="build", when="@:4.5.5")  # No core Fortran code since 4.6
+    depends_on("fortran", type="build", when="+cp2k")  # Need Fortan compiler for CP2K
 
     variant(
         "mpi", default=True, description="Activate MPI support (disable for Thread-MPI support)"