diff --git a/src/video/SDL_video.c b/src/video/SDL_video.c
index 1b82a466de..8848247518 100644
--- a/src/video/SDL_video.c
+++ b/src/video/SDL_video.c
@@ -106,7 +106,7 @@ static VideoBootStrap *bootstrap[] = {
 #ifdef SDL_VIDEO_DRIVER_KMSDRM
     &KMSDRM_bootstrap,
 #endif
-#if SDL_VIDEO_DRIVER_RISCOS
+#ifdef SDL_VIDEO_DRIVER_RISCOS
     &RISCOS_bootstrap,
 #endif
 #ifdef SDL_VIDEO_DRIVER_RPI
@@ -4795,7 +4795,7 @@ int SDL_ShowMessageBox(const SDL_MessageBoxData *messageboxdata, int *buttonid)
         retval = 0;
     }
 #endif
-#if SDL_VIDEO_DRIVER_RISCOS
+#ifdef SDL_VIDEO_DRIVER_RISCOS
     if (retval == -1 &&
         SDL_IsMessageboxValidForDriver(messageboxdata, SDL_SYSWM_RISCOS) &&
         RISCOS_ShowMessageBox(messageboxdata, buttonid) == 0) {
diff --git a/src/video/riscos/SDL_riscosevents.c b/src/video/riscos/SDL_riscosevents.c
index 42e6e825e5..182f447cd4 100644
--- a/src/video/riscos/SDL_riscosevents.c
+++ b/src/video/riscos/SDL_riscosevents.c
@@ -20,7 +20,7 @@
 */
 #include "SDL_internal.h"
 
-#if SDL_VIDEO_DRIVER_RISCOS
+#ifdef SDL_VIDEO_DRIVER_RISCOS
 
 #include "../../events/SDL_events_c.h"
 
diff --git a/src/video/riscos/SDL_riscosframebuffer.c b/src/video/riscos/SDL_riscosframebuffer.c
index 69c01e7998..b7b1049d2d 100644
--- a/src/video/riscos/SDL_riscosframebuffer.c
+++ b/src/video/riscos/SDL_riscosframebuffer.c
@@ -20,7 +20,7 @@
 */
 #include "SDL_internal.h"
 
-#if SDL_VIDEO_DRIVER_RISCOS
+#ifdef SDL_VIDEO_DRIVER_RISCOS
 
 #include "../SDL_sysvideo.h"
 #include "SDL_riscosframebuffer_c.h"
diff --git a/src/video/riscos/SDL_riscosmessagebox.c b/src/video/riscos/SDL_riscosmessagebox.c
index b5c6a74ce3..223ef8d7a1 100644
--- a/src/video/riscos/SDL_riscosmessagebox.c
+++ b/src/video/riscos/SDL_riscosmessagebox.c
@@ -20,7 +20,7 @@
 */
 #include "SDL_internal.h"
 
-#if SDL_VIDEO_DRIVER_RISCOS
+#ifdef SDL_VIDEO_DRIVER_RISCOS
 
 #include "SDL_riscosmessagebox.h"
 
diff --git a/src/video/riscos/SDL_riscosmessagebox.h b/src/video/riscos/SDL_riscosmessagebox.h
index 22be8fd930..ef16f392aa 100644
--- a/src/video/riscos/SDL_riscosmessagebox.h
+++ b/src/video/riscos/SDL_riscosmessagebox.h
@@ -20,7 +20,7 @@
 */
 #include "SDL_internal.h"
 
-#if SDL_VIDEO_DRIVER_RISCOS
+#ifdef SDL_VIDEO_DRIVER_RISCOS
 
 extern int RISCOS_ShowMessageBox(const SDL_MessageBoxData *messageboxdata, int *buttonid);
 
diff --git a/src/video/riscos/SDL_riscosmodes.c b/src/video/riscos/SDL_riscosmodes.c
index c10a1868ad..6b4a9d64c3 100644
--- a/src/video/riscos/SDL_riscosmodes.c
+++ b/src/video/riscos/SDL_riscosmodes.c
@@ -20,7 +20,7 @@
 */
 #include "SDL_internal.h"
 
-#if SDL_VIDEO_DRIVER_RISCOS
+#ifdef SDL_VIDEO_DRIVER_RISCOS
 
 #include "../SDL_sysvideo.h"
 #include "../../events/SDL_mouse_c.h"
diff --git a/src/video/riscos/SDL_riscosmouse.c b/src/video/riscos/SDL_riscosmouse.c
index 9ce9e34b11..16324318bf 100644
--- a/src/video/riscos/SDL_riscosmouse.c
+++ b/src/video/riscos/SDL_riscosmouse.c
@@ -20,7 +20,7 @@
 */
 #include "SDL_internal.h"
 
-#if SDL_VIDEO_DRIVER_RISCOS
+#ifdef SDL_VIDEO_DRIVER_RISCOS
 
 #include "../../events/SDL_mouse_c.h"
 
diff --git a/src/video/riscos/SDL_riscosvideo.c b/src/video/riscos/SDL_riscosvideo.c
index 84871e78d1..7dfae8a04b 100644
--- a/src/video/riscos/SDL_riscosvideo.c
+++ b/src/video/riscos/SDL_riscosvideo.c
@@ -20,7 +20,7 @@
 */
 #include "SDL_internal.h"
 
-#if SDL_VIDEO_DRIVER_RISCOS
+#ifdef SDL_VIDEO_DRIVER_RISCOS
 
 #include "../SDL_sysvideo.h"
 #include "../SDL_pixels_c.h"
diff --git a/src/video/riscos/SDL_riscoswindow.c b/src/video/riscos/SDL_riscoswindow.c
index 4bd522c82f..743f7aba5e 100644
--- a/src/video/riscos/SDL_riscoswindow.c
+++ b/src/video/riscos/SDL_riscoswindow.c
@@ -20,7 +20,7 @@
 */
 #include "SDL_internal.h"
 
-#if SDL_VIDEO_DRIVER_RISCOS
+#ifdef SDL_VIDEO_DRIVER_RISCOS
 
 #include "../SDL_sysvideo.h"
 #include "../../events/SDL_mouse_c.h"