diff --git a/lib/hooks/dft.cpp b/lib/hooks/dft.cpp
index b23869f19..7fcfc7a97 100644
--- a/lib/hooks/dft.cpp
+++ b/lib/hooks/dft.cpp
@@ -173,6 +173,7 @@ public:
 	virtual void prepare()
 	{
 		MultiSignalHook::prepare();
+
 		dumperEnable = logger->level() <= SPDLOG_LEVEL_DEBUG;
 
 		signal_list_clear(&signals);
@@ -253,7 +254,7 @@ public:
 
 		Hook::parse(json);
 
-		ret = json_unpack_ex(json, &err, 0, "{ s?: i, s?: F, s?: F, s?: F, s?: i , s?: i, s?: s, s?: s, s?: s, s?: b, s?: i, s?: s}",
+		ret = json_unpack_ex(json, &err, 0, "{ s?: i, s?: F, s?: F, s?: F, s?: i, s?: i, s?: s, s?: s, s?: s, s?: b, s?: i, s?: s}",
 			"sample_rate", &sampleRate,
 			"start_freqency", &startFrequency,
 			"end_freqency", &endFreqency,
diff --git a/lib/hooks/gate.cpp b/lib/hooks/gate.cpp
index 156beab60..91887a406 100644
--- a/lib/hooks/gate.cpp
+++ b/lib/hooks/gate.cpp
@@ -106,6 +106,8 @@ public:
 	{
 		assert(state == State::CHECKED);
 
+		SingleSignalHook::prepare();
+
 		/* Check if signal type is float */
 		auto sig = (struct signal *) vlist_at(&signals, signalIndex);
 		if (sig->type != SignalType::FLOAT)
diff --git a/lib/hooks/pps_ts.cpp b/lib/hooks/pps_ts.cpp
index d5e4fcdc0..beab9210d 100644
--- a/lib/hooks/pps_ts.cpp
+++ b/lib/hooks/pps_ts.cpp
@@ -94,8 +94,8 @@ public:
 		const char *mode_str = nullptr;
 
 		double fSmps = 0;
-		ret = json_unpack_ex(json, &err, 0, "{ s?: f, s: F, s?: i, s?: i }",
-			"mode", &mode,
+		ret = json_unpack_ex(json, &err, 0, "{ s?: s, s?: f, s: F, s?: i, s?: i }",
+			"mode", &mode_str,
 			"threshold", &threshold,
 			"expected_smp_rate", &fSmps,
 			"horizon_estimation", &horizonEstimation,