diff --git a/src/actors/mario_sign/render.inc.c b/src/actors/mario_sign/render.inc.c
index 84e1a8068..0bf10bf88 100644
--- a/src/actors/mario_sign/render.inc.c
+++ b/src/actors/mario_sign/render.inc.c
@@ -1,6 +1,7 @@
 #include <actors.h>
 #include <main.h>
 #include <assets/mario_raceway_data.h>
+#include "port/interpolation/FrameInterpolation.h"
 
 /**
  * @brief Renders the Mario sign actor.
diff --git a/src/actors/yoshi_egg/render.inc.c b/src/actors/yoshi_egg/render.inc.c
index 2e0fe8ac0..f39524aa3 100644
--- a/src/actors/yoshi_egg/render.inc.c
+++ b/src/actors/yoshi_egg/render.inc.c
@@ -2,6 +2,7 @@
 #include <actors.h>
 #include <defines.h>
 #include <main.h>
+#include "port/interpolation/FrameInterpolation.h"
 
 /**
  * @brief Renders the Yoshi egg actor.
diff --git a/src/animation.c b/src/animation.c
index 92525dfc7..ed290ef7a 100644
--- a/src/animation.c
+++ b/src/animation.c
@@ -8,6 +8,7 @@
 #include <libultra/gbi.h>
 #include "code_80057C60.h"
 #include "engine/Matrix.h"
+#include "port/interpolation/FrameInterpolation.h"
 
 Vec3s sOriginalPosAnimation;
 s16 isNotTheFirst;
diff --git a/src/port/interpolation/matrix.c b/src/port/interpolation/matrix.c
index 4f8a7839b..5580975a5 100644
--- a/src/port/interpolation/matrix.c
+++ b/src/port/interpolation/matrix.c
@@ -2,6 +2,7 @@
 #include <math.h>
 #include "matrix.h"
 #include "common_structs.h"
+#include "FrameInterpolation.h"
 
 Mtx gIdentityMtx = gdSPDefMtx(1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f);
 Matrix gIdentityMatrix = { {
diff --git a/src/racing/skybox_and_splitscreen.c b/src/racing/skybox_and_splitscreen.c
index be56d22f1..abc7c23aa 100644
--- a/src/racing/skybox_and_splitscreen.c
+++ b/src/racing/skybox_and_splitscreen.c
@@ -21,6 +21,7 @@
 #include "engine/courses/Course.h"
 #include "port/Game.h"
 #include "math_util.h"
+#include "port/interpolation/FrameInterpolation.h"
 
 Vp D_802B8880[] = {
     { { { 640, 480, 511, 0 }, { 640, 480, 511, 0 } } },