diff --git a/src/DSP/FFT.cpp b/src/DSP/FFT.cpp
index 568d53718..dadd79f03 100644
--- a/src/DSP/FFT.cpp
+++ b/src/DSP/FFT.cpp
@@ -142,9 +142,9 @@ void FFT::ProcessLoop()
                 if (resultsCallback)
                 {
                     // to log scale
-                    for (uint i = 0; i < fftBins.size(); ++i)
+                    for (size_t i = 0; i < fftBins.size(); ++i)
                         avgOutput[i] = sqrt(avgOutput[i] / avgCount);
-                    for (uint i = 0; i < fftBins.size(); ++i)
+                    for (size_t i = 0; i < fftBins.size(); ++i)
                     {
                         fftBins[i] = avgOutput[i] > 0 ? 10 * log10(avgOutput[i]) : -150;
                     }
diff --git a/src/lms7002m/LMS7002M_validation.cpp b/src/lms7002m/LMS7002M_validation.cpp
index 6093fc699..f1942918b 100644
--- a/src/lms7002m/LMS7002M_validation.cpp
+++ b/src/lms7002m/LMS7002M_validation.cpp
@@ -67,7 +67,7 @@ bool LMS7002M_Validate(const SDRDevice::SDRConfig& cfg, std::vector<std::string>
             errors.push_back(strFormat("Tx ch%i LO (%g) out of range [%g:%g]", i, ch.tx.centerFrequency, minLO, maxLO));
 
         // TODO: make warning if rx loopback selection does not work with tx output
-        if (ch.rx.enabled && not InRange(ch.rx.path, 0, 5))
+        if (ch.rx.enabled && !InRange(ch.rx.path, 0, 5))
             errors.push_back(strFormat("Rx ch%i invalid path(%i)", i, ch.rx.path));
 
         if (ch.tx.enabled && !InRange(ch.tx.path, 0, 2))