diff --git a/src/algorithms/acquisition/gnuradio_blocks/pcps_acquisition.cc b/src/algorithms/acquisition/gnuradio_blocks/pcps_acquisition.cc
index a62e13025..c4ec0cadb 100644
--- a/src/algorithms/acquisition/gnuradio_blocks/pcps_acquisition.cc
+++ b/src/algorithms/acquisition/gnuradio_blocks/pcps_acquisition.cc
@@ -659,6 +659,10 @@ void pcps_acquisition::acquisition_core(uint64_t samp_count)
                << ", doppler_step: " << d_doppler_step
                << ", use_CFAR_algorithm_flag: " << (d_use_CFAR_algorithm_flag ? "true" : "false");
 
+    if (d_acq_parameters.blocking)
+        {
+            lk.unlock();
+        }
     // Doppler frequency grid loop
     if (!d_step_two)
         {
@@ -780,6 +784,11 @@ void pcps_acquisition::acquisition_core(uint64_t samp_count)
                 }
         }
 
+    if (d_acq_parameters.blocking)
+        {
+            lk.lock();
+        }
+
     if (!d_acq_parameters.bit_transition_flag)
         {
             if (d_test_statistics > d_threshold)