diff --git a/src/bicgstabl.jl b/src/bicgstabl.jl
index d1e3d04e..a9431df2 100644
--- a/src/bicgstabl.jl
+++ b/src/bicgstabl.jl
@@ -185,7 +185,7 @@ function bicgstabl!(x, A, b, l = 2;
     history[:tol] = tol
 
     # This doesn't yet make sense: the number of iters is smaller.
-    log && reserve!(history, :resnorm, max_mv_products)
+    log && reserve!(typeof(tol), history, :resnorm, max_mv_products)
 
     # Actually perform CG
     iterable = bicgstabl_iterator!(x, A, b, l; Pl = Pl, tol = tol, max_mv_products = max_mv_products, kwargs...)
diff --git a/src/cg.jl b/src/cg.jl
index edfa86e8..67ae036b 100644
--- a/src/cg.jl
+++ b/src/cg.jl
@@ -209,7 +209,7 @@ function cg!(x, A, b;
 )
     history = ConvergenceHistory(partial = !log)
     history[:tol] = tol
-    log && reserve!(history, :resnorm, maxiter + 1)
+    log && reserve!(typeof(tol), history, :resnorm, maxiter + 1)
 
     # Actually perform CG
     iterable = cg_iterator!(x, A, b, Pl; tol = tol, maxiter = maxiter, statevars = statevars, kwargs...)
diff --git a/src/chebyshev.jl b/src/chebyshev.jl
index 4441ddde..a7afc670 100644
--- a/src/chebyshev.jl
+++ b/src/chebyshev.jl
@@ -139,7 +139,7 @@ function chebyshev!(x, A, b, λmin::Real, λmax::Real;
 )
     history = ConvergenceHistory(partial=!log)
     history[:tol] = tol
-    reserve!(history, :resnorm, maxiter)
+    reserve!(typeof(tol), history, :resnorm, maxiter)
 
     verbose && @printf("=== chebyshev ===\n%4s\t%7s\n","iter","resnorm")
 
diff --git a/src/gmres.jl b/src/gmres.jl
index be0e6307..223ad46a 100644
--- a/src/gmres.jl
+++ b/src/gmres.jl
@@ -181,7 +181,7 @@ function gmres!(x, A, b;
 )
     history = ConvergenceHistory(partial = !log, restart = restart)
     history[:tol] = tol
-    log && reserve!(history, :resnorm, maxiter)
+    log && reserve!(typeof(tol), history, :resnorm, maxiter)
 
     iterable = gmres_iterable!(x, A, b; Pl = Pl, Pr = Pr, tol = tol, maxiter = maxiter, restart = restart, initially_zero = initially_zero)
 
diff --git a/src/idrs.jl b/src/idrs.jl
index 2478c39b..8da92e90 100644
--- a/src/idrs.jl
+++ b/src/idrs.jl
@@ -46,7 +46,7 @@ function idrs!(x, A, b;
     )
     history = ConvergenceHistory(partial=!log)
     history[:tol] = tol
-    reserve!(history,:resnorm, maxiter)
+    reserve!(typeof(tol), history,:resnorm, maxiter)
     idrs_method!(history, x, A, b, s, tol, maxiter; kwargs...)
     log && shrink!(history)
     log ? (x, history) : x
diff --git a/src/minres.jl b/src/minres.jl
index 4e959333..bc30bbab 100644
--- a/src/minres.jl
+++ b/src/minres.jl
@@ -200,7 +200,7 @@ function minres!(x, A, b;
 )
     history = ConvergenceHistory(partial = !log)
     history[:tol] = tol
-    log && reserve!(history, :resnorm, maxiter)
+    log && reserve!(typeof(tol), history, :resnorm, maxiter)
 
     iterable = minres_iterable!(x, A, b;
         skew_hermitian = skew_hermitian,
diff --git a/src/qmr.jl b/src/qmr.jl
index 7201aa3b..6c87ef41 100644
--- a/src/qmr.jl
+++ b/src/qmr.jl
@@ -262,7 +262,7 @@ function qmr!(x, A, b;
 )
     history = ConvergenceHistory(partial = !log)
     history[:tol] = tol
-    log && reserve!(history, :resnorm, maxiter)
+    log && reserve!(typeof(tol), history, :resnorm, maxiter)
 
     iterable = qmr_iterable!(x, A, b; tol = tol, maxiter = maxiter, initially_zero = initially_zero)
 
diff --git a/src/simple.jl b/src/simple.jl
index e9c9844b..c8baf63e 100644
--- a/src/simple.jl
+++ b/src/simple.jl
@@ -126,7 +126,7 @@ function powm!(B, x;
 )
     history = ConvergenceHistory(partial = !log)
     history[:tol] = tol
-    reserve!(history, :resnorm, maxiter)
+    reserve!(typeof(tol), history, :resnorm, maxiter)
     verbose && @printf("=== powm ===\n%4s\t%7s\n", "iter", "resnorm")
 
     iterable = powm_iterable!(B, x, tol = tol, maxiter = maxiter)