diff --git a/build_scripts/qt/compilers/clang-gcc-common-switches.pri b/build_scripts/qt/compilers/clang-gcc-common-switches.pri
index 9436a7c..fca9988 100644
--- a/build_scripts/qt/compilers/clang-gcc-common-switches.pri
+++ b/build_scripts/qt/compilers/clang-gcc-common-switches.pri
@@ -8,4 +8,4 @@ QMAKE_CXXFLAGS += -Wnon-virtual-dtor
 
 QMAKE_CXXFLAGS += -Wcast-align -Wunused -Woverloaded-virtual -Wformat=2
 
-QMAKE_CXXFLAGS += -Wdouble-promotion -Wmissing-variable-declarations
+QMAKE_CXXFLAGS += -Wdouble-promotion
diff --git a/build_scripts/qt/compilers/clang-msvc.pri b/build_scripts/qt/compilers/clang-msvc.pri
index d80d1c5..bdd6f8a 100644
--- a/build_scripts/qt/compilers/clang-msvc.pri
+++ b/build_scripts/qt/compilers/clang-msvc.pri
@@ -12,7 +12,7 @@ include(clang-gcc-common-switches.pri)
 
 QMAKE_CXXFLAGS += -Wmost
 
-QMAKE_CXXFLAGS += -Weffc++
+QMAKE_CXXFLAGS += -Weffc++ -Wmissing-variable-declarations
 
 #clang-msvc spams warnings on -Wconversion and -Wsign-conversion
 # from the moc .cpp files including Qt stuff.
diff --git a/build_scripts/qt/compilers/clang.pri b/build_scripts/qt/compilers/clang.pri
index 3c433c0..146318e 100644
--- a/build_scripts/qt/compilers/clang.pri
+++ b/build_scripts/qt/compilers/clang.pri
@@ -11,4 +11,4 @@ QMAKE_CXXFLAGS += --system-header-prefix=third-party
 # Sign conversion warns on auto generated Qt MOC files.
 QMAKE_CXXFLAGS += -Weffc++ -Wconversion -Wno-sign-conversion
 
-QMAKE_CXXFLAGS += -Wextra-semi -Wzero-as-null-pointer-constant
+QMAKE_CXXFLAGS += -Wextra-semi -Wzero-as-null-pointer-constant  -Wmissing-variable-declarations