diff --git a/src/karts/kart_properties.hpp b/src/karts/kart_properties.hpp
index 235ed561c..43b4873ef 100644
--- a/src/karts/kart_properties.hpp
+++ b/src/karts/kart_properties.hpp
@@ -482,8 +482,10 @@ public:
     float getNitroMax() const;
 
     float getSlipstreamDuration() const;
+    float getSlipstreamBaseSpeed() const;
     float getSlipstreamLength() const;
     float getSlipstreamWidth() const;
+    float getSlipstreamInnerFactor() const;
     float getSlipstreamCollectTime() const;
     float getSlipstreamUseTime() const;
     float getSlipstreamAddPower() const;