diff --git a/internal/core/src/common/Tracer.h b/internal/core/src/common/Tracer.h
index bcca453f1f..ba29828164 100644
--- a/internal/core/src/common/Tracer.h
+++ b/internal/core/src/common/Tracer.h
@@ -19,7 +19,7 @@ namespace milvus::tracer {
 
 struct TraceConfig {
     std::string exporter;
-    int sampleFraction;
+    float sampleFraction;
     std::string jaegerURL;
     std::string otlpEndpoint;
     bool oltpSecure;
diff --git a/internal/core/src/common/type_c.h b/internal/core/src/common/type_c.h
index f9eed84fe7..48eb069373 100644
--- a/internal/core/src/common/type_c.h
+++ b/internal/core/src/common/type_c.h
@@ -92,7 +92,7 @@ typedef struct CStorageConfig {
 
 typedef struct CTraceConfig {
     const char* exporter;
-    int sampleFraction;
+    float sampleFraction;
     const char* jaegerURL;
     const char* otlpEndpoint;
     bool oltpSecure;
diff --git a/internal/util/initcore/init_core.go b/internal/util/initcore/init_core.go
index a9cd20d561..51f47f194c 100644
--- a/internal/util/initcore/init_core.go
+++ b/internal/util/initcore/init_core.go
@@ -45,12 +45,21 @@ func InitLocalChunkManager(path string) {
 }
 
 func InitTraceConfig(params *paramtable.ComponentParam) {
+	sampleFraction := C.float(params.TraceCfg.SampleFraction.GetAsFloat())
+	nodeID := C.int(paramtable.GetNodeID())
+	exporter := C.CString(params.TraceCfg.Exporter.GetValue())
+	jaegerURL := C.CString(params.TraceCfg.JaegerURL.GetValue())
+	endpoint := C.CString(params.TraceCfg.OtlpEndpoint.GetValue())
+	defer C.free(unsafe.Pointer(exporter))
+	defer C.free(unsafe.Pointer(jaegerURL))
+	defer C.free(unsafe.Pointer(endpoint))
+
 	config := C.CTraceConfig{
-		exporter:       C.CString(params.TraceCfg.Exporter.GetValue()),
-		sampleFraction: C.int(params.TraceCfg.SampleFraction.GetAsInt()),
-		jaegerURL:      C.CString(params.TraceCfg.JaegerURL.GetValue()),
-		otlpEndpoint:   C.CString(params.TraceCfg.OtlpEndpoint.GetValue()),
-		nodeID:         C.int(paramtable.GetNodeID()),
+		exporter:       exporter,
+		sampleFraction: sampleFraction,
+		jaegerURL:      jaegerURL,
+		otlpEndpoint:   endpoint,
+		nodeID:         nodeID,
 	}
 	C.InitTrace(&config)
 }