diff --git a/keyexec.c b/keyexec.c
index 53395a1..ee461ea 100644
--- a/keyexec.c
+++ b/keyexec.c
@@ -92,7 +92,7 @@ int main( int argc, const char* argv[] )
   // identifiers and paths to programs
   prog_name[0] = "rdesktop";
   prog_path[0] = "/usr/bin/rdesktop";
-  prog_sring[0] = "";
+  prog_sring[0] = NULL;
   prog_name[1] = "rdesktop1";
   prog_path[1] = "/usr/bin/rdesktop";
   prog_sring[1] = "/usr/bin/kstart --window=.* --desktop=1";
@@ -214,7 +214,7 @@ int main( int argc, const char* argv[] )
 
       // allocate memory and create a line running
       char *buff;
-      if (str_prog_ks == "")
+      if (str_prog_ks == NULL)
         {
           char *com = "keyexec | %s %s";
           buff = (char*) malloc (strlen(com)+strlen(str_prog)+strlen(argv[2])+1);