diff --git a/snakemake/resources.py b/snakemake/resources.py
index 98a5d0c4b..8db3fd483 100644
--- a/snakemake/resources.py
+++ b/snakemake/resources.py
@@ -619,7 +619,7 @@ def infer_resources(name, value, resources: dict):
             raise WorkflowError(
                 f"Cannot parse mem or disk value into size in MB for setting {inferred_name} resource: {value}"
             )
-        resources[inferred_name] = max(int(round(in_bytes / 1000 / 1000)), 1)
+        resources[inferred_name] = max(int(round(in_bytes / 1024 / 1024)), 1)
     elif name == "runtime" and isinstance(value, str):
         try:
             resources["runtime"] = max(int(round(parse_timespan(value) / 60)), 1)