diff --git a/rtl/aix/system.pp b/rtl/aix/system.pp
index a638107dab..db90559b96 100644
--- a/rtl/aix/system.pp
+++ b/rtl/aix/system.pp
@@ -171,7 +171,7 @@ var
 
   procedure AddBuf;
   begin
-    reallocmem(cmdline,size+bufsize);
+    sysreallocmem(cmdline,size+bufsize);
     move(buf^,cmdline[size],bufsize);
     inc(size,bufsize);
     bufsize:=0;
diff --git a/rtl/nds/system.pp b/rtl/nds/system.pp
index ac44e01b89..582d15e499 100644
--- a/rtl/nds/system.pp
+++ b/rtl/nds/system.pp
@@ -179,7 +179,7 @@ var
 
   procedure AddBuf;
   begin
-    reallocmem(calculated_cmdline,size+bufsize);
+    sysreallocmem(calculated_cmdline,size+bufsize);
     move(buf^,calculated_cmdline[size],bufsize);
     inc(size,bufsize);
     bufsize:=0;
diff --git a/rtl/solaris/system.pp b/rtl/solaris/system.pp
index 5c9343808d..350a751a95 100644
--- a/rtl/solaris/system.pp
+++ b/rtl/solaris/system.pp
@@ -203,7 +203,7 @@ var
 
   procedure AddBuf;
   begin
-    reallocmem(cmdline,size+bufsize);
+    sysreallocmem(cmdline,size+bufsize);
     move(buf^,cmdline[size],bufsize);
     inc(size,bufsize);
     bufsize:=0;
diff --git a/rtl/wii/system.pp b/rtl/wii/system.pp
index 17172ad332..f25f6db41b 100644
--- a/rtl/wii/system.pp
+++ b/rtl/wii/system.pp
@@ -148,7 +148,7 @@ var
 
   procedure AddBuf;
   begin
-    reallocmem(calculated_cmdline,size+bufsize);
+    sysreallocmem(calculated_cmdline,size+bufsize);
     move(buf^,calculated_cmdline[size],bufsize);
     inc(size,bufsize);
     bufsize:=0;