diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -300,7 +300,14 @@
 
 check_include_file("sys/prctl.h" HAVE_SYS_PRCTL_H)
 check_symbol_exists(PR_SET_DUMPABLE "sys/prctl.h" HAVE_PR_SET_DUMPABLE)
-add_feature_info("prctl-dumpable" HAVE_PR_SET_DUMPABLE "Required for disallow ptrace on kwin_wayland process")
+check_include_file("sys/procctl.h" HAVE_SYS_PROCCTL_H)
+check_symbol_exists(PROC_TRACE_CTL "sys/procctl.h" HAVE_PROC_TRACE_CTL)
+if (HAVE_PR_SET_DUMPABLE OR HAVE_PROC_TRACE_CTL)
+    set(CAN_DISABLE_PTRACE TRUE)
+endif()
+add_feature_info("prctl/procctl tracing control"
+                 CAN_DISABLE_PTRACE
+                 "Required for disallowing ptrace on kwin_wayland process")
 
 configure_file(config-kwin.h.cmake ${CMAKE_CURRENT_BINARY_DIR}/config-kwin.h )
 
diff --git a/config-kwin.h.cmake b/config-kwin.h.cmake
--- a/config-kwin.h.cmake
+++ b/config-kwin.h.cmake
@@ -17,6 +17,8 @@
 #cmakedefine01 HAVE_WAYLAND_EGL
 #cmakedefine01 HAVE_SYS_PRCTL_H
 #cmakedefine01 HAVE_PR_SET_DUMPABLE
+#cmakedefine01 HAVE_SYS_PROCCTL_H
+#cmakedefine01 HAVE_PROC_TRACE_CTL
 #cmakedefine01 HAVE_BREEZE_DECO
 #if HAVE_BREEZE_DECO
 #define BREEZE_KDECORATION_PLUGIN_ID "${BREEZE_KDECORATION_PLUGIN_ID}"
diff --git a/main_wayland.cpp b/main_wayland.cpp
--- a/main_wayland.cpp
+++ b/main_wayland.cpp
@@ -56,6 +56,10 @@
 #if HAVE_SYS_PRCTL_H
 #include <sys/prctl.h>
 #endif
+#if HAVE_SYS_PROCCTL_H
+#include <unistd.h>
+#include <sys/procctl.h>
+#endif
 
 #include <iostream>
 #include <iomanip>
@@ -403,6 +407,14 @@
     // disable ptrace in kwin_wayland
     prctl(PR_SET_DUMPABLE, 0);
 #endif
+#if HAVE_PROC_TRACE_CTL
+    // FreeBSD's rudimentary procfs does not support /proc/<pid>/exe
+    // We could use the P_TRACED flag of the process to find out
+    // if the process is being debugged ond FreeBSD.
+    int mode = PROC_TRACE_CTL_DISABLE;
+    procctl(P_PID, getpid(), PROC_TRACE_CTL, &mode);
+#endif
+
 }
 
 } // namespace