diff --git a/src/k_kart.c b/src/k_kart.c
index e8160ac51..1dd48083d 100644
--- a/src/k_kart.c
+++ b/src/k_kart.c
@@ -6829,17 +6829,17 @@ boolean K_PlayerEBrake(player_t *player)
 	&& leveltime > starttime;
 }
 
-tic_t K_GetSpindashChargeTime(player_t *player)
+static tic_t K_GetSpindashChargeTime(player_t *player)
 {
 	return (player->kartspeed + 4)*TICRATE/3; // more charge time for higher speed: Tails = 2s, Mighty = 3s, Fang = 4s
 }
 
-fixed_t K_GetSpindashChargeSpeed(player_t *player)
+static fixed_t K_GetSpindashChargeSpeed(player_t *player)
 {
 	return FixedMul(FRACUNIT + (player->kartweight - 5)*FRACUNIT/12, K_GetKartSpeed(player, false)); // more speed for higher weight: Tails = 75%, Fang = 100%, Mighty = 125%
 }
 
-void K_KartSpindash(player_t *player)
+static void K_KartSpindash(player_t *player)
 {
 	ticcmd_t *cmd = &player->cmd;
 
diff --git a/src/p_slopes.c b/src/p_slopes.c
index 0296ef38f..6c44d2d9e 100644
--- a/src/p_slopes.c
+++ b/src/p_slopes.c
@@ -22,6 +22,7 @@
 #include "r_main.h"
 #include "p_maputl.h"
 #include "w_wad.h"
+#include "k_kart.h" // K_PlayerEBrake
 
 #ifdef ESLOPE