diff --git a/ebpf/session.go b/ebpf/session.go
index da132352cd..f2d1a2a545 100644
--- a/ebpf/session.go
+++ b/ebpf/session.go
@@ -18,7 +18,6 @@ import (
 	"syscall"
 
 	"github.com/cilium/ebpf"
-	"github.com/cilium/ebpf/btf"
 	"github.com/cilium/ebpf/link"
 	"github.com/cilium/ebpf/perf"
 	"github.com/go-kit/log"
@@ -173,12 +172,11 @@ func (s *session) Start() error {
 		if err != nil {
 			return fmt.Errorf("unable to get pid namespace %w", err)
 		}
-		err = spec.RewriteConstants(map[string]interface{}{
-			"global_config": pyrobpf.ProfileGlobalConfigT{
-				NsPidIno: nsIno,
-			},
-		})
-		if err != nil {
+		v, ok := spec.Variables["global_config"]
+		if !ok {
+			return fmt.Errorf("pyrobpf rewrite constants: variable global_config not found")
+		}
+		if err := v.Set(pyrobpf.ProfileGlobalConfigT{NsPidIno: nsIno}); err != nil {
 			return fmt.Errorf("pyrobpf rewrite constants %w", err)
 		}
 	}
@@ -189,8 +187,6 @@ func (s *session) Start() error {
 		return fmt.Errorf("load bpf objects: %w", err)
 	}
 
-	btf.FlushKernelSpec() // save some memory
-
 	eventsReader, err := perf.NewReader(s.bpf.ProfileMaps.Events, 4*os.Getpagesize())
 	if err != nil {
 		s.stopLocked()
diff --git a/ebpf/session_python.go b/ebpf/session_python.go
index 7f1e1fc9be..c5ec2a6230 100644
--- a/ebpf/session_python.go
+++ b/ebpf/session_python.go
@@ -10,7 +10,6 @@ import (
 	"time"
 
 	"github.com/cilium/ebpf"
-	"github.com/cilium/ebpf/btf"
 	"github.com/go-kit/log/level"
 	"github.com/grafana/pyroscope/ebpf/pyrobpf"
 	"github.com/grafana/pyroscope/ebpf/python"
@@ -107,8 +106,6 @@ func (s *session) getPyPerf(cause *sd.Target) *python.Perf {
 }
 
 func (s *session) loadPyPerf(cause *sd.Target) (*python.Perf, error) {
-	defer btf.FlushKernelSpec() // save some memory
-
 	opts := &ebpf.CollectionOptions{
 		Programs: s.progOptions(),
 		MapReplacements: map[string]*ebpf.Map{
@@ -124,14 +121,15 @@ func (s *session) loadPyPerf(cause *sd.Target) (*python.Perf, error) {
 	if err != nil {
 		return nil, fmt.Errorf("unable to get pid namespace %w", err)
 	}
-	err = spec.RewriteConstants(map[string]interface{}{
-		"global_config": python.PerfGlobalConfigT{
-			BpfLogErr:   boolToU8(s.pythonBPFErrorLogEnabled(cause)),
-			BpfLogDebug: boolToU8(s.pythonBPFDebugLogEnabled(cause)),
-			NsPidIno:    nsIno,
-		},
-	})
-	if err != nil {
+	v, ok := spec.Variables["global_config"]
+	if !ok {
+		return nil, fmt.Errorf("pyperf rewrite constants: variable global_config not found")
+	}
+	if err := v.Set(python.PerfGlobalConfigT{
+		BpfLogErr:   boolToU8(s.pythonBPFErrorLogEnabled(cause)),
+		BpfLogDebug: boolToU8(s.pythonBPFDebugLogEnabled(cause)),
+		NsPidIno:    nsIno,
+	}); err != nil {
 		return nil, fmt.Errorf("pyperf rewrite constants %w", err)
 	}
 	if s.options.BPFMapsOptions.SymbolsMapSize != 0 {