diff --git a/tests/unittests/omemo/stub_omemo.c b/tests/unittests/omemo/stub_omemo.c
index 986de079..095fd81c 100644
--- a/tests/unittests/omemo/stub_omemo.c
+++ b/tests/unittests/omemo/stub_omemo.c
@@ -109,7 +109,7 @@ omemo_encrypt_file(FILE* in, FILE* out, off_t file_size, int* gcry_res)
 {
     return NULL;
 };
-void omemo_free(void* a){};
+void omemo_free(void* a) {};
 
 uint32_t
 omemo_device_id()
diff --git a/tests/unittests/tools/stub_aesgcm_download.c b/tests/unittests/tools/stub_aesgcm_download.c
index 07f411ca..62c41de8 100644
--- a/tests/unittests/tools/stub_aesgcm_download.c
+++ b/tests/unittests/tools/stub_aesgcm_download.c
@@ -22,7 +22,7 @@ aesgcm_file_get(void* userdata)
     return NULL;
 };
 
-void aesgcm_download_cancel_processes(ProfWin* window){};
-void aesgcm_download_add_download(AESGCMDownload* download){};
+void aesgcm_download_cancel_processes(ProfWin* window) {};
+void aesgcm_download_add_download(AESGCMDownload* download) {};
 
 #endif
diff --git a/tests/unittests/tools/stub_http_download.c b/tests/unittests/tools/stub_http_download.c
index aff47200..8acecdff 100644
--- a/tests/unittests/tools/stub_http_download.c
+++ b/tests/unittests/tools/stub_http_download.c
@@ -27,7 +27,7 @@ http_file_get(void* userdata)
     return NULL;
 }
 
-void http_download_cancel_processes(){};
-void http_download_add_download(){};
+void http_download_cancel_processes() {};
+void http_download_add_download() {};
 
 #endif
diff --git a/tests/unittests/tools/stub_http_upload.c b/tests/unittests/tools/stub_http_upload.c
index 49320f85..d1d0e59c 100644
--- a/tests/unittests/tools/stub_http_upload.c
+++ b/tests/unittests/tools/stub_http_upload.c
@@ -38,7 +38,7 @@ file_size(int filedes)
     return 0;
 }
 
-void http_upload_cancel_processes(){};
-void http_upload_add_upload(){};
+void http_upload_cancel_processes() {};
+void http_upload_add_upload() {};
 
 #endif
diff --git a/tests/unittests/ui/stub_ui.c b/tests/unittests/ui/stub_ui.c
index 6ee0ed25..3dead0db 100644
--- a/tests/unittests/ui/stub_ui.c
+++ b/tests/unittests/ui/stub_ui.c
@@ -484,10 +484,10 @@ mucwin_unset_message_char(ProfMucWin* mucwin)
 {
 }
 
-void win_update_entry_message(ProfWin* window, const char* const id, const char* const message){};
-void win_mark_received(ProfWin* window, const char* const id){};
-void win_print_http_transfer(ProfWin* window, const char* const message, char* id){};
-void win_print_loading_history(ProfWin* window){};
+void win_update_entry_message(ProfWin* window, const char* const id, const char* const message) {};
+void win_mark_received(ProfWin* window, const char* const id) {};
+void win_print_http_transfer(ProfWin* window, const char* const message, char* id) {};
+void win_print_loading_history(ProfWin* window) {};
 
 void
 ui_show_roster(void)
diff --git a/tests/unittests/xmpp/stub_avatar.c b/tests/unittests/xmpp/stub_avatar.c
index 8390077e..022664ac 100644
--- a/tests/unittests/xmpp/stub_avatar.c
+++ b/tests/unittests/xmpp/stub_avatar.c
@@ -2,7 +2,7 @@
 #include <glib.h>
 #include <stdlib.h>
 
-void avatar_pep_subscribe(void){};
+void avatar_pep_subscribe(void) {};
 
 gboolean
 avatar_get_by_nick(const char* nick, gboolean open)
diff --git a/tests/unittests/xmpp/stub_xmpp.c b/tests/unittests/xmpp/stub_xmpp.c
index 366f26b3..5af8c5c2 100644
--- a/tests/unittests/xmpp/stub_xmpp.c
+++ b/tests/unittests/xmpp/stub_xmpp.c
@@ -312,8 +312,8 @@ presence_sub_request_exists(const char* const bare_jid)
 }
 
 // iq functions
-void iq_disable_carbons(){};
-void iq_enable_carbons(){};
+void iq_disable_carbons() {};
+void iq_enable_carbons() {};
 void
 iq_send_software_version(const char* const fulljid)
 {