diff --git a/cmake/extern/CURL.txt.in b/cmake/extern/CURL.txt.in
index 93f90097..6f6c98f4 100644
--- a/cmake/extern/CURL.txt.in
+++ b/cmake/extern/CURL.txt.in
@@ -12,6 +12,7 @@ include(ExternalProject)
 ExternalProject_Add(CURL
   GIT_REPOSITORY    https://github.com/curl/curl
   GIT_TAG           curl-7_66_0
+  GIT_CONFIG        advice.detachedHead=false
   SOURCE_DIR        "${EXTERNAL_LIBRARY_DIR}/curl/src"
   BINARY_DIR        "${EXTERNAL_LIBRARY_DIR}/curl/build"
   CONFIGURE_COMMAND ""
diff --git a/cmake/extern/GTest.txt.in b/cmake/extern/GTest.txt.in
index 1f7aa71c..e3aee00b 100644
--- a/cmake/extern/GTest.txt.in
+++ b/cmake/extern/GTest.txt.in
@@ -12,6 +12,7 @@ include(ExternalProject)
 ExternalProject_Add(GoogleTest
   GIT_REPOSITORY    https://github.com/google/googletest.git
   GIT_TAG           v1.10.x
+  GIT_CONFIG        advice.detachedHead=false
   SOURCE_DIR        "${EXTERNAL_LIBRARY_DIR}/googletest/src"
   BINARY_DIR        "${EXTERNAL_LIBRARY_DIR}/googletest/build"
   CONFIGURE_COMMAND ""