diff --git a/Project.toml b/Project.toml
index b4982780..78c34f3a 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "RegularizedLeastSquares"
 uuid = "1e9c538a-f78c-5de5-8ffb-0b6dbe892d23"
 authors = ["Tobias Knopp <tobias@knoppweb.de>"]
-version = "0.5"
+version = "0.5.1"
 
 [deps]
 IterativeSolvers = "42fd0dbc-a981-5370-80f2-aaf504508153"
@@ -13,7 +13,7 @@ SparsityOperators = "a5ff1dd3-4e0a-50db-9022-6d011c1d5846"
 
 [compat]
 julia = "1.0"
-SparsityOperators = "0.1.4"
+SparsityOperators = "0.1.5"
 ProgressMeter = "1.2"
 IterativeSolvers = "0.8"
 
diff --git a/src/Utils.jl b/src/Utils.jl
index 0b67c3cb..64c84b7a 100644
--- a/src/Utils.jl
+++ b/src/Utils.jl
@@ -221,7 +221,7 @@ function applyConstraints(x, sparseTrafo, enforceReal, enforcePositive, constrai
   enforceReal && enfReal!(x, mask)
   enforcePositive && enfPos!(x, mask)
   if sparseTrafo != nothing
-    x[:] = sparseTrafo' * x
+    x[:] = adjoint(sparseTrafo)*x
   end
 end
 
diff --git a/src/proximalMaps/ProxL1.jl b/src/proximalMaps/ProxL1.jl
index e1a84a33..592a8eda 100644
--- a/src/proximalMaps/ProxL1.jl
+++ b/src/proximalMaps/ProxL1.jl
@@ -20,7 +20,7 @@ function proxL1!(x::Array{T}, λ::Float64; sparseTrafo::Trafo=nothing, kargs...)
     z[:] = [i*max( (abs(i)-λ)/abs(i),0 ) for i in z]
   end
   if sparseTrafo != nothing
-    x[:] = sparseTrafo\z
+    x[:] = adjoint(sparseTrafo)*z
   else
     x[:] = z
   end
diff --git a/src/proximalMaps/ProxL21.jl b/src/proximalMaps/ProxL21.jl
index 2d8b9292..6feb4409 100644
--- a/src/proximalMaps/ProxL21.jl
+++ b/src/proximalMaps/ProxL21.jl
@@ -22,7 +22,7 @@ function proxL21!(x::Vector{T},λ::Float64; sparseTrafo::Trafo=nothing, slices::
     proxL21!(z, λ, slices)
   end
   if sparseTrafo != nothing
-    x[:] = sparseTrafo\z
+    x[:] = adjoint(sparseTrafo)*z
   else
     x[:] = z
   end
@@ -37,7 +37,7 @@ end
 
 """
     normL21(x::Vector{T}, λ::Float64; sparseTrafo::Trafo=nothing, slices::Int64=1, kargs...) where T
-    
+
 return the value of the L21-regularization term.
 Arguments are the same as in `proxL21!`
 """