diff --git a/src/L2_projection.jl b/src/L2_projection.jl
index deebc6dd8b..70b997410f 100644
--- a/src/L2_projection.jl
+++ b/src/L2_projection.jl
@@ -81,7 +81,7 @@ end
 function _assemble_L2_matrix(fe_values, set, dh)
 
     n = Ferrite.getnbasefunctions(fe_values)
-    M = Symmetric(create_matrix(create_sparsity_pattern(dh; nnz_per_row = 2 * n)))
+    M = Symmetric(create_matrix(create_sparsity_pattern!(init_sparsity_pattern(dh; nnz_per_row = 2 * n), dh)))
     assembler = start_assemble(M)
 
     Me = zeros(n, n)