diff --git a/dlls/mmdevapi/audio.c b/dlls/mmdevapi/audio.c
index ddd97e8..ea9305a 100644
--- a/dlls/mmdevapi/audio.c
+++ b/dlls/mmdevapi/audio.c
@@ -17,7 +17,6 @@
  */
 
 #define NONAMELESSUNION
-#define CINTERFACE
 #define COBJMACROS
 #include "config.h"
 
diff --git a/dlls/mmdevapi/audiovolume.c b/dlls/mmdevapi/audiovolume.c
index 5e8994a..0a0dbc4 100644
--- a/dlls/mmdevapi/audiovolume.c
+++ b/dlls/mmdevapi/audiovolume.c
@@ -18,7 +18,6 @@
 
 
 #define NONAMELESSUNION
-#define CINTERFACE
 #define COBJMACROS
 #include "config.h"
 
diff --git a/dlls/mmdevapi/devenum.c b/dlls/mmdevapi/devenum.c
index 6fa637f..79e004d 100644
--- a/dlls/mmdevapi/devenum.c
+++ b/dlls/mmdevapi/devenum.c
@@ -29,7 +29,6 @@
 #endif
 
 #define NONAMELESSUNION
-#define CINTERFACE
 #define COBJMACROS
 #include "windef.h"
 #include "winbase.h"
diff --git a/dlls/mmdevapi/main.c b/dlls/mmdevapi/main.c
index c8fcea0..b916df0 100644
--- a/dlls/mmdevapi/main.c
+++ b/dlls/mmdevapi/main.c
@@ -29,7 +29,6 @@
 #include <OpenAL/alc.h>
 #endif
 
-#define CINTERFACE
 #define COBJMACROS
 #include "windef.h"
 #include "winbase.h"
diff --git a/dlls/mmdevapi/tests/capture.c b/dlls/mmdevapi/tests/capture.c
index 724753c..a1d36e6 100644
--- a/dlls/mmdevapi/tests/capture.c
+++ b/dlls/mmdevapi/tests/capture.c
@@ -23,7 +23,6 @@
 
 #include "wine/test.h"
 
-#define CINTERFACE
 #define COBJMACROS
 
 #ifdef STANDALONE
diff --git a/dlls/mmdevapi/tests/dependency.c b/dlls/mmdevapi/tests/dependency.c
index 62bc4e6..c14208e 100644
--- a/dlls/mmdevapi/tests/dependency.c
+++ b/dlls/mmdevapi/tests/dependency.c
@@ -18,7 +18,6 @@
 
 #include "wine/test.h"
 
-#define CINTERFACE
 #define COBJMACROS
 
 #ifdef STANDALONE
diff --git a/dlls/mmdevapi/tests/mmdevenum.c b/dlls/mmdevapi/tests/mmdevenum.c
index f2b8f13..2ccaa81 100644
--- a/dlls/mmdevapi/tests/mmdevenum.c
+++ b/dlls/mmdevapi/tests/mmdevenum.c
@@ -18,7 +18,6 @@
 
 #include "wine/test.h"
 
-#define CINTERFACE
 #define COBJMACROS
 
 #include "initguid.h"
diff --git a/dlls/mmdevapi/tests/propstore.c b/dlls/mmdevapi/tests/propstore.c
index 13d6f75..d0a0c86 100644
--- a/dlls/mmdevapi/tests/propstore.c
+++ b/dlls/mmdevapi/tests/propstore.c
@@ -19,7 +19,6 @@
 #define NONAMELESSUNION
 #include "wine/test.h"
 
-#define CINTERFACE
 #define COBJMACROS
 
 #ifdef STANDALONE
diff --git a/dlls/mmdevapi/tests/render.c b/dlls/mmdevapi/tests/render.c
index 43cb341..254c94d 100644
--- a/dlls/mmdevapi/tests/render.c
+++ b/dlls/mmdevapi/tests/render.c
@@ -23,7 +23,6 @@
 
 #include "wine/test.h"
 
-#define CINTERFACE
 #define COBJMACROS
 
 #ifdef STANDALONE