diff --git a/src/internal/goexperiment/exp_heapminimum512kib_off.go b/src/internal/goexperiment/exp_heapminimum512kib_off.go
new file mode 100644
index 00000000000..09da431b407
--- /dev/null
+++ b/src/internal/goexperiment/exp_heapminimum512kib_off.go
@@ -0,0 +1,9 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build !goexperiment.heapminimum512kib
+// +build !goexperiment.heapminimum512kib
+
+package goexperiment
+
+const HeapMinimum512KiB = false
+const HeapMinimum512KiBInt = 0
diff --git a/src/internal/goexperiment/exp_heapminimum512kib_on.go b/src/internal/goexperiment/exp_heapminimum512kib_on.go
new file mode 100644
index 00000000000..bab684b5e68
--- /dev/null
+++ b/src/internal/goexperiment/exp_heapminimum512kib_on.go
@@ -0,0 +1,9 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build goexperiment.heapminimum512kib
+// +build goexperiment.heapminimum512kib
+
+package goexperiment
+
+const HeapMinimum512KiB = true
+const HeapMinimum512KiBInt = 1
diff --git a/src/internal/goexperiment/flags.go b/src/internal/goexperiment/flags.go
index 3bf19222e1c..6d935edc2b2 100644
--- a/src/internal/goexperiment/flags.go
+++ b/src/internal/goexperiment/flags.go
@@ -89,4 +89,11 @@ type Flags struct {
 	// Details regarding the new pacer may be found at
 	// https://golang.org/design/44167-gc-pacer-redesign
 	PacerRedesign bool
+
+	// HeapMinimum512KiB reduces the minimum heap size to 512 KiB.
+	//
+	// This was originally reduced as part of PacerRedesign, but
+	// has been broken out to its own experiment that is disabled
+	// by default.
+	HeapMinimum512KiB bool
 }
diff --git a/src/runtime/mgcpacer.go b/src/runtime/mgcpacer.go
index 868666036c3..6df8af45a8b 100644
--- a/src/runtime/mgcpacer.go
+++ b/src/runtime/mgcpacer.go
@@ -53,8 +53,8 @@ const (
 	gcOverAssistWork = 64 << 10
 
 	// defaultHeapMinimum is the value of heapMinimum for GOGC==100.
-	defaultHeapMinimum = goexperiment.PacerRedesignInt*(512<<10) +
-		(1-goexperiment.PacerRedesignInt)*(4<<20)
+	defaultHeapMinimum = (goexperiment.HeapMinimum512KiBInt)*(512<<10) +
+		(1-goexperiment.HeapMinimum512KiBInt)*(4<<20)
 
 	// scannableStackSizeSlack is the bytes of stack space allocated or freed
 	// that can accumulate on a P before updating gcController.stackSize.