diff --git a/.ci/ogc/build.sh b/.ci/ogc/build.sh
index 7bbfb6d43d2..0edf4f36157 100755
--- a/.ci/ogc/build.sh
+++ b/.ci/ogc/build.sh
@@ -22,7 +22,6 @@ cmake -GNinja \
  -DWITH_3D=OFF \
  -DWITH_STAGED_PLUGINS=OFF \
  -DWITH_GRASS=OFF \
- -DSUPPRESS_QT_WARNINGS=ON \
  -DENABLE_MODELTEST=OFF \
  -DENABLE_PGTEST=OFF \
  -DENABLE_MSSQLTEST=OFF \
diff --git a/.docker/docker-qgis-build.sh b/.docker/docker-qgis-build.sh
index ec4d47c5044..8ae149e715b 100755
--- a/.docker/docker-qgis-build.sh
+++ b/.docker/docker-qgis-build.sh
@@ -90,7 +90,6 @@ cmake \
  -DWITH_GRASS7=${WITH_GRASS7} \
  -DWITH_GRASS8=${WITH_GRASS8} \
  -DWITH_GRASS_PLUGIN=${WITH_GRASS8} \
- -DSUPPRESS_QT_WARNINGS=ON \
  -DENABLE_TESTS=ON \
  -DENABLE_MODELTEST=${WITH_QT5} \
  -DENABLE_PGTEST=${WITH_QT5} \
diff --git a/.docker/qgis.dockerfile b/.docker/qgis.dockerfile
index dbfb6c20574..31d5789ee14 100644
--- a/.docker/qgis.dockerfile
+++ b/.docker/qgis.dockerfile
@@ -42,7 +42,6 @@ RUN SUCCESS=OK \
   -DBINDINGS_GLOBAL_INSTALL=ON \
   -DWITH_STAGED_PLUGINS=ON \
   -DWITH_GRASS=ON \
-  -DSUPPRESS_QT_WARNINGS=ON \
   -DDISABLE_DEPRECATED=ON \
   -DENABLE_TESTS=OFF \
   -DWITH_QSPATIALITE=ON \
diff --git a/CMakeLists.txt b/CMakeLists.txt
index a58881918c0..1c0e1a69dab 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -675,13 +675,6 @@ if(WITH_CORE)
     find_package(Libtasn1 REQUIRED)
   endif()
 
-  if (SUPPRESS_QT_WARNINGS)
-    # Newer versions of UseQt4.cmake include Qt with -isystem automatically
-    # This can be used to force this behavior on older systems
-    # Can be removed as soon as Travis-CI updates from precise
-    include_directories(SYSTEM ${QT_INCLUDE_DIR})
-  endif()
-
   # Disable automatic conversion from QString to ASCII 8-bit strings (char *)
   # (Keeps code compatible with Qt/Mac/64bit)
   add_definitions(-DQT_NO_CAST_TO_ASCII)