diff --git a/ion/src/blackbox/display.cpp b/ion/src/blackbox/display.cpp
index dc4cb94e2..e153fbc58 100644
--- a/ion/src/blackbox/display.cpp
+++ b/ion/src/blackbox/display.cpp
@@ -29,9 +29,6 @@ void pullRect(KDRect r, KDColor * pixels) {
   }
 }
 
-void waitForVBlank() {
-}
-
 }
 }
 
diff --git a/ion/src/emscripten/display.cpp b/ion/src/emscripten/display.cpp
index 703109a3d..dbc464619 100644
--- a/ion/src/emscripten/display.cpp
+++ b/ion/src/emscripten/display.cpp
@@ -27,9 +27,6 @@ void pullRect(KDRect r, KDColor * pixels) {
   sFrameBuffer.pullRect(r, pixels);
 }
 
-void waitForVBlank() {
-}
-
 }
 }
 
diff --git a/ion/src/shared/dummy/display.cpp b/ion/src/shared/dummy/display.cpp
index 62e6e7268..dde7dd686 100644
--- a/ion/src/shared/dummy/display.cpp
+++ b/ion/src/shared/dummy/display.cpp
@@ -2,3 +2,6 @@
 
 void Ion::Display::POSTPushBlackWhite() {
 }
+
+void Ion::Display::waitForVBlank() {
+}
diff --git a/ion/src/simulator/init.cpp b/ion/src/simulator/init.cpp
index b8bf9693d..d67d521d5 100644
--- a/ion/src/simulator/init.cpp
+++ b/ion/src/simulator/init.cpp
@@ -71,9 +71,6 @@ void Ion::Display::pullRect(KDRect r, KDColor * pixels) {
   sFrameBuffer->pullRect(r, pixels);
 }
 
-void Ion::Display::waitForVBlank() {
-}
-
 Ion::Keyboard::State Ion::Keyboard::scan() {
   Ion::Keyboard::State result = 0;
   for (int i = 0; i < Ion::Keyboard::NumberOfKeys; i++) {