diff --git a/src/config.rs b/src/config.rs
index 61f8d81..7d69d30 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -41,7 +41,7 @@ pub struct GlobalPreferences {
     pub use_min_frame_period: bool,
     /// XRT_DEBUG_GUI (1, 0) + XRT_CURATED_GUI (1, 0)
     pub monado_ui: bool,
-    /// U_PACING_COMP_TIME_FRACTIONPERCENT=95 + XRT_COMPOSITOR_USE_PRESENT_WAIT=1
+    /// U_PACING_COMP_TIME_FRACTION_PERCENT=95 + XRT_COMPOSITOR_USE_PRESENT_WAIT=1
     #[serde(default)]
     pub nvidia_mitigation: bool,
     #[serde(default)]
@@ -94,7 +94,7 @@ impl GlobalPreferences {
             ),
         ]);
         if self.nvidia_mitigation {
-            res.insert("U_PACING_COMP_TIME_FRACTIONPERCENT".into(), "95".into());
+            res.insert("U_PACING_COMP_TIME_FRACTION_PERCENT".into(), "95".into());
             res.insert("XRT_COMPOSITOR_USE_PRESENT_WAIT".into(), "1".into());
         }
         res.extend(self.env_vars.clone());