diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3cf6a1790..1a9fe9850 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -316,9 +316,14 @@ find_package(OpenSceneGraph 3.2.0 REQUIRED
 
 find_package(sentry QUIET)
 
+set(sentry_api_key $ENV{FLIGHTGEAR_SENTRY_API_KEY})
 if (TARGET sentry::sentry)
-    message(STATUS "Sentry.io crash reporting enabled")
-    set(HAVE_SENTRY 1)
+    if (NOT sentry_api_key)
+        message(STATUS "Sentry.io crash reporting detected, but FLIGHTGEAR_SENTRY_API_KEY not set")
+    else()
+        message(STATUS "Sentry.io crash reporting enabled")
+        set(HAVE_SENTRY 1)
+    endif()
 endif()
 
 #if(${CMAKE_SYSTEM_NAME} MATCHES "OpenBSD")
diff --git a/src/Include/config_cmake.h.in b/src/Include/config_cmake.h.in
index 8d67682e1..0edfd2e15 100644
--- a/src/Include/config_cmake.h.in
+++ b/src/Include/config_cmake.h.in
@@ -70,3 +70,4 @@
 #cmakedefine ENABLE_SWIFT
 
 #cmakedefine HAVE_SENTRY
+#define SENTRY_API_KEY "@sentry_api_key@"
diff --git a/src/Main/sentryIntegration.cxx b/src/Main/sentryIntegration.cxx
index e116a2a79..e2fcc03e8 100644
--- a/src/Main/sentryIntegration.cxx
+++ b/src/Main/sentryIntegration.cxx
@@ -40,7 +40,10 @@ namespace flightgear
 void initSentry()
 {
     sentry_options_t *options = sentry_options_new();
-    sentry_options_set_dsn(options, "https://3a3f0bf24d5d482388dd060860c18ffe@sentry.io/5188535");
+    // API key is defined in config.h, set in an environment variable prior
+    // to running CMake, so it can be customised. Env var at build time is:
+    // FLIGHTGEAR_SENTRY_API_KEY
+    sentry_options_set_dsn(options, SENTRY_API_KEY);
     
     if (strcmp(FG_BUILD_TYPE, "Dev") == 0) {
         sentry_options_set_release(options, "flightgear-dev@" FLIGHTGEAR_VERSION);