diff --git a/src/Common/getCurrentProcessFDCount.cpp b/src/Common/getCurrentProcessFDCount.cpp
index a78cc9fb1a0..b85256fabb4 100644
--- a/src/Common/getCurrentProcessFDCount.cpp
+++ b/src/Common/getCurrentProcessFDCount.cpp
@@ -9,6 +9,7 @@
 
 int getCurrentProcessFDCount()
 {
+    int result = -1;
 #if defined(__linux__)  || defined(__APPLE__)
     using namespace DB;
 
@@ -21,6 +22,7 @@ int getCurrentProcessFDCount()
 
     try
     {
+        readIntText(result, command->out);
         command->wait();
     }
     catch (...)
@@ -31,25 +33,13 @@ int getCurrentProcessFDCount()
 
         try
         {
+            readIntText(result, command->out);
             command->wait();
         }
         catch (...)
         {
-            return -1;
         }
     }
-
-    WriteBufferFromOwnString out;
-    copyData(command->out, out);
-
-    if (!out.str().empty())
-    {
-        return parse<Int32>(out.str());
-    }
-
-    return -1;
-#else
-    return -1;
 #endif
-
+    return result;
 }
diff --git a/src/Common/getMaxFileDescriptorCount.cpp b/src/Common/getMaxFileDescriptorCount.cpp
index 853a2c327c3..053ac0f812d 100644
--- a/src/Common/getMaxFileDescriptorCount.cpp
+++ b/src/Common/getMaxFileDescriptorCount.cpp
@@ -6,29 +6,21 @@
 
 int getMaxFileDescriptorCount()
 {
+    int result = -1;
 #if defined(__linux__) || defined(__APPLE__)
     using namespace DB;
 
     auto command = ShellCommand::execute("ulimit -n");
     try
     {
+        readIntText(result, command->out);
         command->wait();
     }
     catch (...)
     {
-        return -1;
     }
 
-    WriteBufferFromOwnString out;
-    copyData(command->out, out);
-
-    if (!out.str().empty())
-    {
-        return parse<Int32>(out.str());
-    }
-
-    return -1;
-#else
-    return -1;
 #endif
+
+    return result;
 }