diff --git a/NEWS.md b/NEWS.md
index 8840da13..a5f6d3ce 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -2,7 +2,10 @@
 
 main
 -------
+## Bug fixes
 
+- `scheduled_diagnostics` are now internally saved as vectors instead of tuples.
+  This has significant compile-time/inference benefits.
 
 v0.2.6
 -------
diff --git a/src/clima_diagnostics.jl b/src/clima_diagnostics.jl
index fa3483d1..16e2e9ac 100644
--- a/src/clima_diagnostics.jl
+++ b/src/clima_diagnostics.jl
@@ -14,7 +14,7 @@ A struct that contains the scheduled diagnostics, ancillary data and areas of me
 to store and accumulate results.
 """
 struct DiagnosticsHandler{
-    SD <: Tuple,
+    SD,
     STORAGE <: Dict,
     ACC <: Dict,
     COUNT <: Dict,
@@ -61,7 +61,7 @@ function DiagnosticsHandler(scheduled_diagnostics, Y, p, t; dt = nothing)
     accumulators = Dict()
     counters = Dict()
 
-    unique_scheduled_diagnostics = Tuple(unique(scheduled_diagnostics))
+    unique_scheduled_diagnostics = unique(scheduled_diagnostics)
     if length(unique_scheduled_diagnostics) != length(scheduled_diagnostics)
         @warn "Given list of diagnostics contains duplicates, removing them"
     end