diff --git a/pkgs/servers/coturn/default.nix b/pkgs/servers/coturn/default.nix
index d076f763bf96..695c881e9f66 100644
--- a/pkgs/servers/coturn/default.nix
+++ b/pkgs/servers/coturn/default.nix
@@ -35,6 +35,13 @@ stdenv.mkDerivation rec {
     ./pure-configure.patch
   ];
 
+  # Workaround build failure on -fno-common toolchains like upstream
+  # gcc-10. Otherwise build fails as:
+  #   ld: ...-libprom-0.1.1/include/prom_collector_registry.h:37: multiple definition of
+  #     `PROM_COLLECTOR_REGISTRY_DEFAULT'; ...-libprom-0.1.1/include/prom_collector_registry.h:37: first defined here
+  # Should be fixed in libprom-1.2.0 and later: https://github.com/digitalocean/prometheus-client-c/pull/25
+  NIX_CFLAGS_COMPILE = "-fcommon";
+
   passthru.tests.coturn = nixosTests.coturn;
 
   meta = with lib; {