diff --git a/aslprep/workflows/asl/base.py b/aslprep/workflows/asl/base.py
index 28335b375..350ff00d5 100644
--- a/aslprep/workflows/asl/base.py
+++ b/aslprep/workflows/asl/base.py
@@ -637,7 +637,7 @@ def init_asl_preproc_wf(asl_file, has_fieldmap=False):
                     **kwargs,
                 ),
                 name=f"warp_{cbf_deriv}_to_t1w",
-                mem_gb=mem_gb * 3 * omp_nthreads,
+                mem_gb=mem_gb["resampled"],
                 n_procs=omp_nthreads,
             )
             # fmt:off