diff --git a/headers/os/net/Certificate.h b/headers/os/net/Certificate.h
index c42207db94..120541a8ea 100644
--- a/headers/os/net/Certificate.h
+++ b/headers/os/net/Certificate.h
@@ -16,8 +16,8 @@ public:
 
 	BString		String();
 
-	bigtime_t	StartDate();
-	bigtime_t	ExpirationDate();
+	time_t		StartDate();
+	time_t		ExpirationDate();
 	BString		Issuer();
 	BString		Subject();
 
diff --git a/src/kits/network/libnetapi/Certificate.cpp b/src/kits/network/libnetapi/Certificate.cpp
index a8cd129933..e456c9c032 100644
--- a/src/kits/network/libnetapi/Certificate.cpp
+++ b/src/kits/network/libnetapi/Certificate.cpp
@@ -71,14 +71,14 @@ BCertificate::String()
 }
 
 
-bigtime_t
+time_t
 BCertificate::StartDate()
 {
 	return parse_ASN1(X509_get_notBefore(fPrivate->fX509));
 }
 
 
-bigtime_t
+time_t
 BCertificate::ExpirationDate()
 {
 	return parse_ASN1(X509_get_notAfter(fPrivate->fX509));
@@ -129,14 +129,14 @@ BCertificate::String()
 }
 
 
-bigtime_t
+time_t
 BCertificate::StartDate()
 {
 	return B_NOT_SUPPORTED;
 }
 
 
-bigtime_t
+time_t
 BCertificate::ExpirationDate()
 {
 	return B_NOT_SUPPORTED;