diff --git a/impl/src/layer1/rx.c b/impl/src/layer1/rx.c
index 983df24..edac5b2 100644
--- a/impl/src/layer1/rx.c
+++ b/impl/src/layer1/rx.c
@@ -1,6 +1,8 @@
 #include <liquid/liquid.h>
 #include <math.h>
 
+#include <assert.h>
+
 #include "correlator.h"
 #include "preamble.h"
 #include "freq_est.h"
@@ -101,6 +103,8 @@ static bool acquire_preamble(layer1_rx_t *rx, const float complex sample)
 			freq_est_history_write_idx = 0;
 		}
 
+		assert(freq_est_history_write_idx < FREQ_EST_L);
+
 		freq_est_history[freq_est_history_write_idx] = sample;
 		freq_est_history_write_idx++;
 
@@ -280,6 +284,8 @@ result_t layer1_rx_process(layer1_rx_t *rx, const float complex *samples, size_t
 		}
 	}
 
+	assert(nsamples2dump <= (sizeof(samples2dump) / sizeof(samples2dump[0])));
+
 	dump_array_cf(samples2dump, nsamples2dump, 1.0f/(RRC_SPS * SYMBOL_RATE), "/tmp/rx_dbg.cpx64");
 
 	return OK;