diff --git a/process/process_darwin.go b/process/process_darwin.go
index 67ad29b..837512c 100644
--- a/process/process_darwin.go
+++ b/process/process_darwin.go
@@ -159,9 +159,6 @@ func (p *Process) Threads() (map[string]string, error) {
 func (p *Process) CPUTimes() (*cpu.CPUTimesStat, error) {
 	return nil, common.NotImplementedError
 }
-func (p *Process) CPUPercent() (int32, error) {
-	return 0, common.NotImplementedError
-}
 func (p *Process) CPUAffinity() ([]int32, error) {
 	return nil, common.NotImplementedError
 }
diff --git a/process/process_freebsd.go b/process/process_freebsd.go
index 373aab5..5fce208 100644
--- a/process/process_freebsd.go
+++ b/process/process_freebsd.go
@@ -144,9 +144,6 @@ func (p *Process) Threads() (map[string]string, error) {
 func (p *Process) CPUTimes() (*cpu.CPUTimesStat, error) {
 	return nil, common.NotImplementedError
 }
-func (p *Process) CPUPercent() (int32, error) {
-	return 0, common.NotImplementedError
-}
 func (p *Process) CPUAffinity() ([]int32, error) {
 	return nil, common.NotImplementedError
 }
diff --git a/process/process_windows.go b/process/process_windows.go
index a6cbe79..436f16f 100644
--- a/process/process_windows.go
+++ b/process/process_windows.go
@@ -135,9 +135,6 @@ func (p *Process) Threads() (map[string]string, error) {
 func (p *Process) CPUTimes() (*cpu.CPUTimesStat, error) {
 	return nil, common.NotImplementedError
 }
-func (p *Process) CPUPercent() (int32, error) {
-	return 0, common.NotImplementedError
-}
 func (p *Process) CPUAffinity() ([]int32, error) {
 	return nil, common.NotImplementedError
 }