diff --git a/wmake/rules/darwinIntel64Clang/general b/wmake/rules/darwinIntel64Clang/general
index 3903ac741..8ec6d800e 100644
--- a/wmake/rules/darwinIntel64Clang/general
+++ b/wmake/rules/darwinIntel64Clang/general
@@ -1,4 +1,4 @@
-CPP        = cpp --traditional-cpp $(GFLAGS)
+CPP        = cpp --traditional-cpp $(GFLAGS) -Ddarwin
 LD         = ld
 # LD         = /opt/local/libexec/llvm-3.3/bin/ld
 
diff --git a/wmake/rules/darwinIntel64Dragonegg/general b/wmake/rules/darwinIntel64Dragonegg/general
index a69a25f37..59873b8da 100644
--- a/wmake/rules/darwinIntel64Dragonegg/general
+++ b/wmake/rules/darwinIntel64Dragonegg/general
@@ -1,4 +1,4 @@
-CPP        = cpp $(GFLAGS)
+CPP        = cpp $(GFLAGS) -Ddarwin
 LD         = ld
 
 PROJECT_LIBS = -l$(WM_PROJECT)
diff --git a/wmake/rules/darwinIntel64Gcc/general b/wmake/rules/darwinIntel64Gcc/general
index 031aad98d..622f137e6 100644
--- a/wmake/rules/darwinIntel64Gcc/general
+++ b/wmake/rules/darwinIntel64Gcc/general
@@ -1,4 +1,4 @@
-CPP        = cpp --traditional-cpp $(GFLAGS)
+CPP        = cpp --traditional-cpp $(GFLAGS) -Ddarwin
 LD         = ld
 
 PROJECT_LIBS = -l$(WM_PROJECT)