diff --git a/dkbuild b/dkbuild
index 43e6e5d..f2cf29e 100755
--- a/dkbuild
+++ b/dkbuild
@@ -2656,9 +2656,10 @@ cd "$projdir"
     }
     function runb() {
         local build="${DEFAULTS[build_build]-1}"
-        if [ -n "$build" ]; then
-            run "$@"
+        if [ -z "$build" ]; then
+            [ $# -eq 0 ] && return 1 || return 0
         fi
+        run "$@"
     }
     function call() {
         edebug "call $(qvals "$@")"
@@ -2668,9 +2669,10 @@ cd "$projdir"
     }
     function callb() {
         local build="${DEFAULTS[build_build]-1}"
-        if [ -n "$build" ]; then
-            call "$@"
+        if [ -z "$build" ]; then
+            [ $# -eq 0 ] && return 1 || return 0
         fi
+        call "$@"
     }
     function dkbuild() {
         edebug "dkbuild $(qvals "$@")"