diff --git a/samples/CMakeLists.txt b/samples/CMakeLists.txt
index d6b3fe4..4f928b2 100644
--- a/samples/CMakeLists.txt
+++ b/samples/CMakeLists.txt
@@ -37,6 +37,7 @@ foreach(sample ${SAMPLES})
 
     add_test(${sample}_compare sh ${CMAKE_CURRENT_LIST_DIR}/tests/run_test.sh "${CMAKE_CURRENT_LIST_DIR}" . . ${sample})
     set_property(TEST ${sample}_compare PROPERTY
+        ENVIRONMENT "LC_ALL=en_US.utf8"
         ENVIRONMENT "CRITERION_ALWAYS_SUCCEED=1"
         ENVIRONMENT "CRITERION_SHORT_FILENAME=1"
     )
@@ -50,6 +51,7 @@ foreach(script ${SCRIPTS})
 
     add_test(${script}_compare sh ${CMAKE_CURRENT_LIST_DIR}/tests/run_test.sh "${CMAKE_CURRENT_LIST_DIR}" . "${CMAKE_CURRENT_LIST_DIR}" tests/${sample})
     set_property(TEST ${script}_compare PROPERTY
+        ENVIRONMENT "LC_ALL=en_US.utf8"
         ENVIRONMENT "CRITERION_ALWAYS_SUCCEED=1"
         ENVIRONMENT "CRITERION_SHORT_FILENAME=1"
     )
diff --git a/samples/asserts.err.expected b/samples/asserts.err.expected
index 4ad5e0f..644a440 100644
--- a/samples/asserts.err.expected
+++ b/samples/asserts.err.expected
@@ -1,6 +1,6 @@
 [----] asserts.c:11: Assertion failed: assert is fatal, expect isn't
 [----] asserts.c:12: Assertion failed: This assert runs
-[FAIL] asserts::base: (0,00s)
+[FAIL] asserts::base: (0.00s)
 [----] asserts.c:20: Assertion failed: The conditions for this test were not met.
-[FAIL] asserts::old_school: (0,00s)
+[FAIL] asserts::old_school: (0.00s)
 [====] Synthesis: Tested: 6 | Passing: 4 | Failing: 2 | Crashing: 0 
diff --git a/samples/description.err.expected b/samples/description.err.expected
index 33ee4a1..64ffe21 100644
--- a/samples/description.err.expected
+++ b/samples/description.err.expected
@@ -1,3 +1,3 @@
 [----] description.c:4: Assertion failed: 0
-[FAIL] misc::failing: (0,00s)
+[FAIL] misc::failing: (0.00s)
 [====] Synthesis: Tested: 1 | Passing: 0 | Failing: 1 | Crashing: 0 
diff --git a/samples/long-messages.err.expected b/samples/long-messages.err.expected
index 2507fbc..9658ae5 100644
--- a/samples/long-messages.err.expected
+++ b/samples/long-messages.err.expected
@@ -2,5 +2,5 @@
 [----]   A long message
 [----]   Spawning multiple lines.
 [----]   Formatting is respected.
-[FAIL] sample::long_msg: (0,00s)
+[FAIL] sample::long_msg: (0.00s)
 [====] Synthesis: Tested: 1 | Passing: 0 | Failing: 1 | Crashing: 0 
diff --git a/samples/report.err.expected b/samples/report.err.expected
index e7b9a78..5b8f140 100644
--- a/samples/report.err.expected
+++ b/samples/report.err.expected
@@ -1,3 +1,3 @@
 [----] report.c:5: Assertion failed: 0
-[FAIL] sample::test: (0,00s)
+[FAIL] sample::test: (0.00s)
 [====] Synthesis: Tested: 1 | Passing: 0 | Failing: 1 | Crashing: 0 
diff --git a/samples/signal.err.expected b/samples/signal.err.expected
index b0d4c59..8bc2b30 100644
--- a/samples/signal.err.expected
+++ b/samples/signal.err.expected
@@ -1,4 +1,4 @@
 [----] signal.c:16: Unexpected signal caught below this line!
 [FAIL] simple::uncaught: CRASH!
-[FAIL] simple::wrong_signal: (0,00s)
+[FAIL] simple::wrong_signal: (0.00s)
 [====] Synthesis: Tested: 3 | Passing: 1 | Failing: 2 | Crashing: 1 
diff --git a/samples/simple.err.expected b/samples/simple.err.expected
index 2131286..ef375ca 100644
--- a/samples/simple.err.expected
+++ b/samples/simple.err.expected
@@ -1,3 +1,3 @@
 [----] simple.c:4: Assertion failed: 0
-[FAIL] misc::failing: (0,00s)
+[FAIL] misc::failing: (0.00s)
 [====] Synthesis: Tested: 2 | Passing: 1 | Failing: 1 | Crashing: 0