diff --git a/pkgs/development/compilers/llvm/7/llvm.nix b/pkgs/development/compilers/llvm/7/llvm.nix
index d3d9a4c506d..dc10de26ba1 100644
--- a/pkgs/development/compilers/llvm/7/llvm.nix
+++ b/pkgs/development/compilers/llvm/7/llvm.nix
@@ -15,7 +15,9 @@
 , debugVersion ? false
 , enableManpages ? false
 , enableSharedLibraries ? true
-, enablePFM ? !stdenv.isDarwin
+, enablePFM ? !(stdenv.isDarwin
+  || stdenv.isAarch64 # broken for Ampere eMAG 8180 (c2.large.arm on Packet) #56245
+  )
 , enablePolly ? false
 }:
 
diff --git a/pkgs/development/compilers/llvm/8/llvm.nix b/pkgs/development/compilers/llvm/8/llvm.nix
index 4ff6cc995a0..18013a9cfad 100644
--- a/pkgs/development/compilers/llvm/8/llvm.nix
+++ b/pkgs/development/compilers/llvm/8/llvm.nix
@@ -14,7 +14,9 @@
 , debugVersion ? false
 , enableManpages ? false
 , enableSharedLibraries ? true
-, enablePFM ? !stdenv.isDarwin
+, enablePFM ? !(stdenv.isDarwin
+  || stdenv.isAarch64 # broken for Ampere eMAG 8180 (c2.large.arm on Packet) #56245
+)
 , enablePolly ? false
 }: