diff --git a/pixi.toml b/pixi.toml
index 56aae35dac..8a8776a3fa 100644
--- a/pixi.toml
+++ b/pixi.toml
@@ -53,9 +53,15 @@ python = "3.11.*"
 [feature.py312.dependencies]
 python = "3.12.*"
 
+[feature.py312.activation.env]
+COVERAGE_CORE = "sysmon"
+
 [feature.py313.dependencies]
 python = "3.13.*"
 
+[feature.py313.activation.env]
+COVERAGE_CORE = "sysmon"
+
 [feature.example.dependencies]
 # Optional dependencies - recommended
 holoviews = ">=1.16.0"