diff --git a/source/dub/compilers/ldc.d b/source/dub/compilers/ldc.d
index 32a4520..3dcfa54 100644
--- a/source/dub/compilers/ldc.d
+++ b/source/dub/compilers/ldc.d
@@ -68,7 +68,7 @@
 				break;
 			case "x86_64":
 				build_platform.architecture = ["x86_64"];
-				settings.addDFlags("-march=x86_64");
+				settings.addDFlags("-march=x86-64");
 				break;
 		}