diff --git a/tools/singularity/ubuntu18.04_amd_rocm.def b/tools/singularity/ubuntu18.04_amd_rocm.def
index 239106b44b..ad7eaaf543 100644
--- a/tools/singularity/ubuntu18.04_amd_rocm.def
+++ b/tools/singularity/ubuntu18.04_amd_rocm.def
@@ -68,5 +68,9 @@ From: rocm/dev-ubuntu-18.04
     make package
     make install
 
+%environment
+        LC_ALL=C
+        export LC_ALL
+
 %labels
     Author rbberger
diff --git a/tools/singularity/ubuntu18.04_intel_opencl.def b/tools/singularity/ubuntu18.04_intel_opencl.def
index 71ad1274fe..389c75699c 100644
--- a/tools/singularity/ubuntu18.04_intel_opencl.def
+++ b/tools/singularity/ubuntu18.04_intel_opencl.def
@@ -61,5 +61,9 @@ From: ubuntu:18.04
     apt-get update
     apt-get install -y intel-opencl-icd
 
+%environment
+        LC_ALL=C
+        export LC_ALL
+
 %labels
     Author rbberger
diff --git a/tools/singularity/ubuntu18.04_nvidia.def b/tools/singularity/ubuntu18.04_nvidia.def
index c1c9fcb5f9..9392821d7e 100644
--- a/tools/singularity/ubuntu18.04_nvidia.def
+++ b/tools/singularity/ubuntu18.04_nvidia.def
@@ -60,5 +60,9 @@ From: nvidia/cuda:10.2-devel-ubuntu18.04
     mkdir -p /etc/OpenCL/vendors
     echo "libnvidia-opencl.so.1" > /etc/OpenCL/vendors/nvidia.icd
 
+%environment
+        LC_ALL=C
+        export LC_ALL
+
 %labels
     Author rbberger