diff --git a/src/rebar_port_compiler.erl b/src/rebar_port_compiler.erl
index 35adc3c..955ae07 100644
--- a/src/rebar_port_compiler.erl
+++ b/src/rebar_port_compiler.erl
@@ -581,6 +581,11 @@ default_env() ->
      {"solaris.*-64$", "CXXFLAGS", "-D_REENTRANT -m64 $CXXFLAGS"},
      {"solaris.*-64$", "LDFLAGS", "-m64 $LDFLAGS"},
 
+     %% Linux specific flags for multiarch
+     {"linux.*-64$", "CFLAGS", "-m64 $CFLAGS"},
+     {"linux.*-64$", "CXXFLAGS", "-m64 $CXXFLAGS"},
+     {"linux.*-64$", "LDFLAGS", "-m64 $LDFLAGS"},
+
      %% OS X Leopard flags for 64-bit
      {"darwin9.*-64$", "CFLAGS", "-m64 $CFLAGS"},
      {"darwin9.*-64$", "CXXFLAGS", "-m64 $CXXFLAGS"},