diff --git a/spack.yaml b/spack.yaml
index 1d733e69ed46cc20e0d5ccc6acff9ade28c96495..8c3c012a0f27ce2bc8ab1e492bcf69d5329127f7 100644
--- a/spack.yaml
+++ b/spack.yaml
@@ -46,7 +46,7 @@ spack:
     - root@6.26.06 cxxstd=17 
           +fftw +fortran +gdml +http +mlp +pythia8 
           +root7 +tmva +vc -webgui +xrootd +ssl 
-    - spdlog@1.10.0
+    - spdlog@1.10.0 +fmt_external
     - stow@2.3.1
     - tensorflow-lite@2.8.0 -xnnpack
     - xrootd@5.3.2 cxxstd=17 +python