diff --git a/config.def.h b/config.def.h
index bc6f57a..bc79e1d 100644
--- a/config.def.h
+++ b/config.def.h
@@ -1,5 +1,10 @@
 /* See LICENSE file for copyright and license details. */
 
+/* Constants */
+#define TERMINAL "st"
+#define TERMCLASS "St"
+#define BROWSER "librewolf"
+
 /* appearance */
 static unsigned int borderpx  = 1;        /* border pixel of windows */
 static unsigned int snap      = 32;       /* snap pixel */
@@ -24,8 +29,8 @@ typedef struct {
 	const char *name;
 	const void *cmd;
 } Sp;
-const char *spcmd1[] = {"st", "-n", "spterm", "-g", "120x34", NULL };
-const char *spcmd2[] = {"st", "-n", "spcalc", "-f", "monospace:size=16", "-g", "50x20", "-e", "bc", "-lq", NULL };
+const char *spcmd1[] = {TERMINAL, "-n", "spterm", "-g", "120x34", NULL };
+const char *spcmd2[] = {TERMINAL, "-n", "spcalc", "-f", "monospace:size=16", "-g", "50x20", "-e", "bc", "-lq", NULL };
 static Sp scratchpads[] = {
 	/* name          cmd  */
 	{"spterm",      spcmd1},
@@ -73,7 +78,7 @@ static const Layout layouts[] = {
 /* commands */
 static char dmenumon[2] = "0"; /* component of dmenucmd, manipulated in spawn() */
 static const char *dmenucmd[] = { "dmenu_run", "-m", dmenumon, "-fn", dmenufont, "-nb", normbgcolor, "-nf", normfgcolor, "-sb", selbordercolor, "-sf", selfgcolor, NULL };
-static const char *termcmd[]  = { "st", NULL };
+static const char *termcmd[]  = { TERMINAL, NULL };
 
 /*
  * Xresources preferences to load at startup