diff --git a/python/plugins/processing/algs/grass7/Grass7Utils.py b/python/plugins/processing/algs/grass7/Grass7Utils.py
index af13db53e72..6e6751b11fa 100644
--- a/python/plugins/processing/algs/grass7/Grass7Utils.py
+++ b/python/plugins/processing/algs/grass7/Grass7Utils.py
@@ -106,7 +106,7 @@ class Grass7Utils:
             si.wShowWindow = subprocess.SW_HIDE
         with subprocess.Popen(
                 [Grass7Utils.command, '-v'],
-                shell=True if isMac() else False,
+                shell=False,
                 stdout=subprocess.PIPE,
                 stdin=subprocess.DEVNULL,
                 stderr=subprocess.STDOUT,
@@ -361,7 +361,7 @@ class Grass7Utils:
 
         with subprocess.Popen(
                 command,
-                shell=True if isMac() else False,
+                shell=False,
                 stdout=subprocess.PIPE,
                 stdin=subprocess.DEVNULL,
                 stderr=subprocess.STDOUT,
@@ -390,7 +390,7 @@ class Grass7Utils:
             command, grassenv = Grass7Utils.prepareGrassExecution(outputCommands)
             with subprocess.Popen(
                     command,
-                    shell=True if isMac() else False,
+                    shell=False,
                     stdout=subprocess.PIPE,
                     stdin=subprocess.DEVNULL,
                     stderr=subprocess.STDOUT,