diff --git a/cmd/viewcore/main.go b/cmd/viewcore/main.go
index ce3c469..26e2785 100644
--- a/cmd/viewcore/main.go
+++ b/cmd/viewcore/main.go
@@ -27,6 +27,7 @@
 
 	"github.com/chzyer/readline"
 	"github.com/spf13/cobra"
+	"github.com/spf13/pflag"
 	"golang.org/x/debug/internal/core"
 	"golang.org/x/debug/internal/gocore"
 )
@@ -253,6 +254,17 @@
 	err     error
 }{}
 
+func ResetSubCommandFlagValues(root *cobra.Command) {
+	for _, c := range root.Commands() {
+		c.Flags().VisitAll(func(f *pflag.Flag) {
+			if f.Changed {
+				f.Value.Set(f.DefValue)
+				f.Changed = false
+			}
+		})
+	}
+}
+
 // readCore reads corefile and returns core and gocore process states.
 func readCore() (*core.Process, *gocore.Process, error) {
 	cc := coreCache
@@ -345,7 +357,7 @@
 		}
 
 		err = capturePanic(func() {
-			root.ResetFlags()
+			ResetSubCommandFlagValues(root)
 			root.SetArgs(strings.Fields(l))
 			root.Execute()
 		})
diff --git a/go.mod b/go.mod
index 73cf21a..ff62e49 100644
--- a/go.mod
+++ b/go.mod
@@ -5,6 +5,7 @@
 require (
 	github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e
 	github.com/spf13/cobra v0.0.3
+	github.com/spf13/pflag v1.0.3
 	golang.org/x/sys v0.0.0-20211025201205-69cdffdb9359
 )
 
@@ -12,5 +13,4 @@
 	github.com/chzyer/logex v1.1.10 // indirect
 	github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1 // indirect
 	github.com/inconshreveable/mousetrap v1.0.0 // indirect
-	github.com/spf13/pflag v1.0.3 // indirect
 )