diff --git a/packages/sda/package.py b/packages/sda/package.py
index 3bb82653351034172b449626bbfad54f5fe9ef5e..ee1a09290c2476efbb9a799163d2490d5c6b2fb6 100644
--- a/packages/sda/package.py
+++ b/packages/sda/package.py
@@ -27,7 +27,7 @@ class Sda(MakefilePackage):
     version('7.3.3d', sha256='295ca0142532759a43375422a4ebc050e15b1c248e45493f5864765a9fe8076f')
 
     # Dependencies.
-    depends_on('gcc@9.4.0:')
+    depends_on('%gcc@9.4.0:')
     depends_on('python@3.8:', type=('build','run'))
     conflicts('%intel')
 
diff --git a/spack.yaml b/spack.yaml
index 50e39ff770b8d60c2fa7eb988a07c53411f1f464..1459ab87ab0d8ab100f354c748b37285a26b8b1e 100644
--- a/spack.yaml
+++ b/spack.yaml
@@ -59,7 +59,7 @@ spack:
     #- biobb-md
     - apbs
     #- py-pdb2pqr
-    #- sda
+    - sda
     # demo for codejam12
     #- funniest1022
   concretization: together