diff --git a/README.md b/README.md
index b613410b6ffe284cb28941c0082fe203db03dd73..8ace1a9fa7bd2810a0a0ef1967e43fe66a234cf6 100644
--- a/README.md
+++ b/README.md
@@ -161,7 +161,7 @@ Options:
   -s, --stats PATH              Path to output stats json file
   -dc, --discordant PATH        Path to output discordant VCF file
   -mq, --min-qual FLOAT         Minimum quality of variants to consider
-  -md, --min-depth FLOAT        Minimum depth of variants to consider
+  -md, --min-depth INTEGER      Minimum depth of variants to consider
   --help                        Show this message and exit.
 ```
 
diff --git a/vtools/cli.py b/vtools/cli.py
index eac0b48a4dcf81ad66d3cb3b91731353faac7b40..f0079b2b6541669687a96c9c74e8f7587ed12796 100644
--- a/vtools/cli.py
+++ b/vtools/cli.py
@@ -39,7 +39,7 @@ from .gcoverage import RefRecord, region_coverages
               required=False)
 @click.option("-mq", "--min-qual", type=float,
               help="Minimum quality of variants to consider", default=30)
-@click.option("-md", "--min-depth", type=float,
+@click.option("-md", "--min-depth", type=int,
               help="Minimum depth of variants to consider", default=0)
 def evaluate_cli(call_vcf, positive_vcf, call_samples, positive_samples,
                  min_qual, min_depth, stats, discordant_vcf):