diff --git a/snappy_wrappers/wrappers/bcftools/TMB/wrapper.py b/snappy_wrappers/wrappers/bcftools/TMB/wrapper.py
index b096a0b25..50085c990 100644
--- a/snappy_wrappers/wrappers/bcftools/TMB/wrapper.py
+++ b/snappy_wrappers/wrappers/bcftools/TMB/wrapper.py
@@ -26,6 +26,9 @@
 set -x
 # -----------------------------------------------------------------------------
 
+# Ensure locale is set to C, such that the printf %f calls work correctly
+export LC_ALL=C
+
 # Write out information about conda installation
 conda list > {snakemake.log.conda_list}
 conda info > {snakemake.log.conda_info}