diff --git a/test/test_cslightcrv.py b/test/test_cslightcrv.py
index ae459e1..e66bd55 100755
--- a/test/test_cslightcrv.py
+++ b/test/test_cslightcrv.py
@@ -85,7 +85,7 @@ class Test(gammalib.GPythonTestSuite):
 
         # Execute cslightcrv, make sure we catch any exception
         try:
-            rc = os.system(cmd+" &>/dev/null")
+            rc = os.system(cmd+" >/dev/null 2>&1")
         except:
             pass
 
@@ -106,7 +106,7 @@ class Test(gammalib.GPythonTestSuite):
 
         # Execute cslightcrv, make sure we catch any exception
         try:
-            rc = os.system(cmd+" &>/dev/null")
+            rc = os.system(cmd+" >/dev/null 2>&1")
         except:
             pass
 
diff --git a/test/test_ctbin.py b/test/test_ctbin.py
index c2ec34f..eab2c70 100755
--- a/test/test_ctbin.py
+++ b/test/test_ctbin.py
@@ -83,7 +83,7 @@ class Test(gammalib.GPythonTestSuite):
 
         # Execute ctbin, make sure we catch any exception
         try:
-            rc = os.system(cmd+" >/dev/null")
+            rc = os.system(cmd+" >/dev/null 2>&1")
         except:
             pass
 
@@ -104,7 +104,7 @@ class Test(gammalib.GPythonTestSuite):
 
         # Execute ctbin, make sure we catch any exception
         try:
-            rc = os.system(cmd+" >/dev/null")
+            rc = os.system(cmd+" >/dev/null 2>&1")
         except:
             pass
 
diff --git a/test/test_ctobssim.py b/test/test_ctobssim.py
index fa235a9..4413eee 100755
--- a/test/test_ctobssim.py
+++ b/test/test_ctobssim.py
@@ -85,7 +85,7 @@ class Test(gammalib.GPythonTestSuite):
 
         # Execute ctobssim, make sure we catch any exception
         try:
-            rc = os.system(cmd+" >/dev/null")
+            rc = os.system(cmd+" >/dev/null 2>&1")
         except:
             pass
 
@@ -106,7 +106,7 @@ class Test(gammalib.GPythonTestSuite):
 
         # Execute ctobssim, make sure we catch any exception
         try:
-            rc = os.system(cmd+" >/dev/null")
+            rc = os.system(cmd+" >/dev/null 2>&1")
         except:
             pass