diff --git a/CMakeLists.txt b/CMakeLists.txt
index b945b2947e..91de839b42 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -113,7 +113,7 @@ include(px4_parse_function_args)
 include(px4_git)
 
 execute_process(
-	COMMAND git describe --always --tags
+	COMMAND git describe --exclude ext/* --always --tags
 	OUTPUT_VARIABLE PX4_GIT_TAG
 	OUTPUT_STRIP_TRAILING_WHITESPACE
 	WORKING_DIRECTORY ${PX4_SOURCE_DIR}
diff --git a/Tools/px4.py b/Tools/px4.py
index 8e09c5079e..4136758873 100755
--- a/Tools/px4.py
+++ b/Tools/px4.py
@@ -65,7 +65,7 @@ def get_version():
 
     if os.path.isdir(os.path.join(px4_dir, '.git')):
         # If inside a clone PX4 Firmware repository, get version from "git describe"
-        cmd = 'git describe --abbrev=0 --tags'
+        cmd = 'git describe --exclude ext/* --abbrev=0 --tags'
         try:
             version = subprocess.check_output(
                 cmd, cwd=px4_dir, shell=True).decode().strip()
diff --git a/Tools/px_mkfw.py b/Tools/px_mkfw.py
index 3484576150..b6638eeffd 100755
--- a/Tools/px_mkfw.py
+++ b/Tools/px_mkfw.py
@@ -99,7 +99,7 @@ if args.summary != None:
 if args.description != None:
 	desc['description']	= str(args.description)
 if args.git_identity != None:
-	cmd = "git --git-dir '{:}/.git' describe --always --tags".format(args.git_identity)
+	cmd = "git --git-dir '{:}/.git' describe --exclude ext/* --always --tags".format(args.git_identity)
 	p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE).stdout
 	desc['git_identity']	= str(p.read().strip())
 	p.close()
diff --git a/src/lib/version/px_update_git_header.py b/src/lib/version/px_update_git_header.py
index 8baea33419..7e455dfa0a 100755
--- a/src/lib/version/px_update_git_header.py
+++ b/src/lib/version/px_update_git_header.py
@@ -37,7 +37,7 @@ header = """
 
 
 # PX4
-git_tag = subprocess.check_output('git describe --always --tags --dirty'.split(),
+git_tag = subprocess.check_output('git describe --exclude ext/* --always --tags --dirty'.split(),
                                   stderr=subprocess.STDOUT).decode('utf-8').strip()
 if validate:
     if verbose: