diff --git a/openhantek/CMakeLists.txt b/openhantek/CMakeLists.txt
index 9641694..bdb4989 100644
--- a/openhantek/CMakeLists.txt
+++ b/openhantek/CMakeLists.txt
@@ -8,6 +8,10 @@ set(CMAKE_AUTOMOC ON)
 set(CMAKE_AUTOUIC ON)
 set(CMAKE_AUTORCC ON)
 
+if (Qt5Widgets_VERSION VERSION_LESS 5.4.0)
+    message(FATAL_ERROR "Minimum supported Qt5 version is 5.4.0!")
+endif()
+
 # include directories
 set(CMAKE_INCLUDE_CURRENT_DIR ON)
 include_directories(src/ src/hantek src/analyse src/widgets src/docks src/configdialog)
diff --git a/readme.md b/readme.md
index 3bff37d..9f36430 100644
--- a/readme.md
+++ b/readme.md
@@ -22,7 +22,7 @@ Navigate to the [Releases](https://github.com/OpenHantek/openhantek/releases) pa
 ## Building OpenHantek from source
 You need the following packages, to build OpenHantek from source:
 * CMake 3.5+
-* Qt 5.3+
+* Qt 5.4+
 * FFTW 3+ (prebuild files will be downloaded on windows)
 * libusb 1.x (prebuild files will be used on windows)