diff --git a/SoapySDR-Support-Build.md b/SoapySDR-Support-Build.md
index 56e677a..106b7da 100644
--- a/SoapySDR-Support-Build.md
+++ b/SoapySDR-Support-Build.md
@@ -10,7 +10,7 @@ git clone https://github.com/pothosware/SoapySDR.git
 cd SoapySDR
 mkdir build
 cd build
-cmake ..
+cmake .. -DCMAKE_BUILD_TYPE=Release
 make
 sudo make install
 sudo ldconfig #only needed on linux systems
@@ -24,7 +24,7 @@ git clone https://github.com/pothosware/SoapyRTLSDR.git
 cd SoapyRTLSDR
 mkdir build
 cd build
-cmake ..
+cmake .. -DCMAKE_BUILD_TYPE=Release
 make
 sudo make install
 sudo ldconfig #only needed on linux systems