diff --git a/src/villas-hook.cpp b/src/villas-hook.cpp
index 2408491ac..4ac3455b9 100644
--- a/src/villas-hook.cpp
+++ b/src/villas-hook.cpp
@@ -222,12 +222,8 @@ check:			if (optarg == endptr)
 
 				throw RuntimeError("Failed to read from stdin");
 			}
-			
-			if (!(smp->flags & SAMPLE_HAS_TS_RECEIVED)){
-			 timespec now = time_now();
-			smp->ts.received = now;
-			smp->flags |= SAMPLE_HAS_TS_RECEIVED;
-			}
+
+			timespec now = time_now();
 
 			logger->debug("Read {} smps from stdin", recv);
 
@@ -235,6 +231,11 @@ check:			if (optarg == endptr)
 			for (int processed = 0; processed < recv; processed++) {
 				struct sample *smp = smps[processed];
 
+				if (!(smp->flags & SAMPLE_HAS_TS_RECEIVED)){
+					smp->ts.received = now;
+					smp->flags |= SAMPLE_HAS_TS_RECEIVED;
+				}
+
 				ret = h->process(smp);
 				switch (ret) {
 					case HOOK_ERROR: