diff --git a/posix.mak b/posix.mak
index 706156b7e15..383218221a9 100644
--- a/posix.mak
+++ b/posix.mak
@@ -141,7 +141,7 @@ else
 endif
 
 # Set DDOC, the documentation generator
-DDOC=dmd
+DDOC=$(DMD)
 
 # Set LIB, the ultimate target
 ifeq (,$(findstring win,$(OS)))