diff --git a/src/sharedspice.c b/src/sharedspice.c
index f21dee18a..0e2d54138 100644
--- a/src/sharedspice.c
+++ b/src/sharedspice.c
@@ -610,7 +610,7 @@ ngSpice_Init(SendChar* printfcn, SendStat* statusfcn, ControlledExit* ngspiceexi
         struct passwd *pw;
         pw = getpwuid(getuid());
 
-        s = tprintf("%s%s", pw->pw_dir, INITSTR);
+        s = tprintf("%s" DIR_PATHSEP "%s", pw->pw_dir, INITSTR);
 
         if (access(s, 0) == 0)
             inp_source(s);
diff --git a/src/tclspice.c b/src/tclspice.c
index f0efe02ca..b34e3b3c5 100644
--- a/src/tclspice.c
+++ b/src/tclspice.c
@@ -2522,7 +2522,7 @@ Spice_Init(Tcl_Interp *interp)
             struct passwd *pw;
             pw = getpwuid(getuid());
 
-            s = tprintf("%s%s", pw->pw_dir, INITSTR);
+            s = tprintf("%s" DIR_PATHSEP "%s", pw->pw_dir, INITSTR);
 
             if (access(s, 0) == 0)
                 inp_source(s);