diff --git a/var/spack/repos/builtin/packages/trilinos/package.py b/var/spack/repos/builtin/packages/trilinos/package.py
index 0b8e82d17ea..93d41dbde79 100644
--- a/var/spack/repos/builtin/packages/trilinos/package.py
+++ b/var/spack/repos/builtin/packages/trilinos/package.py
@@ -203,6 +203,7 @@ class Trilinos(CMakePackage, CudaPackage):
         conflicts('~stratimikos')
         conflicts('@:12 gotype=long')
 
+    conflicts('+aztec', when='~fortran')
     conflicts('+basker', when='~amesos2')
     conflicts('+ifpack2', when='~belos')
     conflicts('+intrepid', when='~sacado')
@@ -272,6 +273,9 @@ class Trilinos(CMakePackage, CudaPackage):
     conflicts('+stokhos', when='%xl')
     conflicts('+stokhos', when='%xl_r')
 
+    # Fortran mangling fails on Apple M1 (see spack/spack#25900)
+    conflicts('@:13.0.1 +fortran', when='target=m1')
+
     # ###################### Dependencies ##########################
 
     # Explicit dependency variants