diff --git a/frustration.rs b/frustration.rs
index c7153cd..95c3c08 100644
--- a/frustration.rs
+++ b/frustration.rs
@@ -51,9 +51,10 @@ struct TableEntry {
 }
 
 // NOTE: lazy_static or SyncLazy would allow nicer init
-const PRIMITIVES: [TableEntry; 12] = [
+const PRIMITIVES: [TableEntry; 13] = [
     TableEntry {f: ret     , name: ShortName {bytes: *b"ret", length: 3}, dict: false, immediate: false},
-    TableEntry {f: lit     , name: ShortName {bytes: *b"lit", length: 3}, dict: false, immediate: false},    
+    TableEntry {f: lit     , name: ShortName {bytes: *b"lit", length: 3}, dict: false, immediate: false},
+    TableEntry {f: call    , name: ShortName {bytes: *b"cal", length: 4}, dict: true,  immediate: false},
     TableEntry {f: dot     , name: ShortName {bytes: *b".  ", length: 1}, dict: true,  immediate: false},
     TableEntry {f: comma_  , name: ShortName {bytes: *b",  ", length: 1}, dict: true,  immediate: false},
     TableEntry {f: store   , name: ShortName {bytes: *b"!  ", length: 1}, dict: true,  immediate: false},
@@ -180,6 +181,11 @@ fn from_r(c: &mut Core) -> u16 {
     return c.rstack[c.trs];
 }
 
+fn call(c: &mut Core) {
+    to_r(c, c.ip);
+    c.ip = pop(c);
+}
+
 // note: this is an inline primitive, not a dict entry
 fn ret(c: &mut Core) {
     if c.trs == 0 {