diff --git a/test/bugfixes-test.sh b/test/bugfixes-test.sh
index 4ccd053e..8359057d 100755
--- a/test/bugfixes-test.sh
+++ b/test/bugfixes-test.sh
@@ -1,5 +1,6 @@
 #! /bin/sh
 # Test driver with regression tests for bugfixes
+export LC_ALL=C
 results="./tmp/bugfixes-test.out"
 good="./data/bugfixes-test.out"
 
diff --git a/test/conversions.sh b/test/conversions.sh
index fb153da8..ae9a447d 100755
--- a/test/conversions.sh
+++ b/test/conversions.sh
@@ -10,6 +10,7 @@ fi
 
 # ----------------------------------------------------------------------
 # Setup
+export LC_ALL=C
 results="./tmp/conversions.out"
 good="./data/conversions.out"
 
diff --git a/test/eps-test.sh b/test/eps-test.sh
index 0479da8b..a2ec045f 100755
--- a/test/eps-test.sh
+++ b/test/eps-test.sh
@@ -1,6 +1,8 @@
 #! /bin/sh
 # Test driver for EPS files
 
+export LC_ALL=C
+
 exiv2="$VALGRIND ../../src/exiv2"
 
 diffargs="--strip-trailing-cr"
diff --git a/test/exiv2-test.sh b/test/exiv2-test.sh
index 7e8c6747..2f358402 100755
--- a/test/exiv2-test.sh
+++ b/test/exiv2-test.sh
@@ -1,5 +1,6 @@
 #! /bin/sh
 # Test driver for exiv2 utility tests
+export LC_ALL=C
 exiv2="$VALGRIND exiv2 -u"
 results="./tmp/exiv2-test.out"
 good="./data/exiv2-test.out"
diff --git a/test/modify-test.sh b/test/modify-test.sh
index a62853be..b474dd6c 100755
--- a/test/modify-test.sh
+++ b/test/modify-test.sh
@@ -1,5 +1,6 @@
 #! /bin/sh
 # Test driver for write unit tests to build Exif metadata from scratch
+export LC_ALL=C
 results="./tmp/modify-test.out"
 good="./data/modify-test.out"
 diffargs="--strip-trailing-cr"
diff --git a/test/xmpparser-test.sh b/test/xmpparser-test.sh
index e597bc2c..c5a1bc9f 100755
--- a/test/xmpparser-test.sh
+++ b/test/xmpparser-test.sh
@@ -10,6 +10,7 @@ fi
 
 # ----------------------------------------------------------------------
 # Setup
+export LC_ALL=C
 results="./tmp/xmpparser-test.out"
 good="./data/xmpparser-test.out"