diff --git a/src/bindings/dotnet/SConscript b/src/bindings/dotnet/SConscript
index afa4c30d3d8dcc0b11b502ecec5db8dc126628c4..1636c6633546c6aa46a376af65af726f6c0d2e98 100644
--- a/src/bindings/dotnet/SConscript
+++ b/src/bindings/dotnet/SConscript
@@ -11,6 +11,7 @@ dotnetenv.Append(CCFLAGS=["-fpic", '-DSWIG', '-Wno-all',
               LIBS=['hammer'],
               LIBPATH=["../.."],
               SWIGFLAGS=["-DHAMMER_INTERNAL__NO_STDARG_H",
+                         "-DSWIG2_CSHARP",
                          "-Isrc/", "-csharp",
                          "-dllimport","hammer_dotnet",
                          "-namespace", "Hammer.Internal"])