diff --git a/src/libsysprof-capture/sysprof-macros.h b/src/libsysprof-capture/sysprof-macros.h
index 9292f924..1bc92afc 100644
--- a/src/libsysprof-capture/sysprof-macros.h
+++ b/src/libsysprof-capture/sysprof-macros.h
@@ -91,9 +91,11 @@
 #ifdef __cplusplus
 #define SYSPROF_BEGIN_DECLS extern "C" {
 #define SYSPROF_END_DECLS }
+#define SYSPROF_RESTRICT /* nothing */
 #else
 #define SYSPROF_BEGIN_DECLS
 #define SYSPROF_END_DECLS
+#define SYSPROF_RESTRICT restrict
 #endif
 
 #if defined (__GNUC__)
diff --git a/src/libsysprof-capture/tests/meson.build b/src/libsysprof-capture/tests/meson.build
index db0a3681..aca73d26 100644
--- a/src/libsysprof-capture/tests/meson.build
+++ b/src/libsysprof-capture/tests/meson.build
@@ -21,6 +21,7 @@ libsysprof_capture_testsuite = {
   'rewrite-pid'             : {'skip': true},
   'test-capture'            : {},
   'test-capture-cursor'     : {},
+  'test-cplusplus'          : {'cpp': true},
   'test-mapped-ring-buffer' : {},
 }
 
@@ -30,10 +31,18 @@ libsysprof_capture_testsuite_deps = [
 ]
 
 foreach test, params: libsysprof_capture_testsuite
-  test_exe = executable(test, '@0@.c'.format(test),
-          c_args: libsysprof_capture_testsuite_c_args,
-    dependencies: libsysprof_capture_testsuite_deps,
-  )
+  if params.get('cpp', false)
+    test_exe = executable(test, '@0@.cpp'.format(test),
+          cpp_args: libsysprof_capture_testsuite_c_args,
+      dependencies: libsysprof_capture_testsuite_deps,
+    )
+  else
+    test_exe = executable(test, '@0@.c'.format(test),
+            c_args: libsysprof_capture_testsuite_c_args,
+      dependencies: libsysprof_capture_testsuite_deps,
+    )
+  endif
+
   if not params.get('skip', false)
     test(test, test_exe, env: libsysprof_capture_test_env)
   endif
diff --git a/src/libsysprof-capture/tests/test-cplusplus.cpp b/src/libsysprof-capture/tests/test-cplusplus.cpp
new file mode 100644
index 00000000..c604a336
--- /dev/null
+++ b/src/libsysprof-capture/tests/test-cplusplus.cpp
@@ -0,0 +1,24 @@
+/*
+ * Copyright 2024 Simon McVittie
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include <sysprof-capture.h>
+
+#undef _NDEBUG
+#include <assert.h>
+
+#ifdef __GNUC__
+#define UNUSED __attribute__((__unused__))
+#else
+#define UNUSED
+#endif
+
+int
+main (UNUSED int   argc,
+      UNUSED char *argv[])
+{
+  assert (sysprof_getpagesize () > 0);
+  return 0;
+}
+
diff --git a/src/libsysprof/sysprof-document-ctrset.h b/src/libsysprof/sysprof-document-ctrset.h
index 3bc6cc32..3806245e 100644
--- a/src/libsysprof/sysprof-document-ctrset.h
+++ b/src/libsysprof/sysprof-document-ctrset.h
@@ -42,7 +42,7 @@ SYSPROF_AVAILABLE_IN_ALL
 void        sysprof_document_ctrset_get_raw_value    (SysprofDocumentCtrset  *self,
                                                       guint                   nth,
                                                       guint                  *id,
-                                                      guint8                  value[restrict 8]);
+                                                      guint8                  value[SYSPROF_RESTRICT 8]);
 
 G_DEFINE_AUTOPTR_CLEANUP_FUNC (SysprofDocumentCtrset, g_object_unref)
 
diff --git a/src/libsysprof/sysprof-time-span.h b/src/libsysprof/sysprof-time-span.h
index a85595a8..b550ac04 100644
--- a/src/libsysprof/sysprof-time-span.h
+++ b/src/libsysprof/sysprof-time-span.h
@@ -60,7 +60,7 @@ sysprof_time_span_relative_to (SysprofTimeSpan time_span,
 static inline void
 sysprof_time_span_normalize (SysprofTimeSpan        time_span,
                              SysprofTimeSpan        allowed,
-                             float                  values[restrict 2])
+                             float                  values[SYSPROF_RESTRICT 2])
 {
   double duration = allowed.end_nsec - allowed.begin_nsec;
 
diff --git a/src/libsysprof/tests/meson.build b/src/libsysprof/tests/meson.build
index 12eabb1e..c4ffc92f 100644
--- a/src/libsysprof/tests/meson.build
+++ b/src/libsysprof/tests/meson.build
@@ -16,6 +16,7 @@ libsysprof_testsuite = {
   'test-allocs-by-func'           : {'skip': true},
   'test-callgraph'                : {'skip': true},
   'test-capture-model'            : {'skip': true},
+  'test-cplusplus'                : {'cpp': true},
   'test-elf-loader'               : {'skip': true},
   'test-leak-detector'            : {'skip': true},
   'test-list-counters'            : {'skip': true},
@@ -41,10 +42,18 @@ libsysprof_testsuite_deps = [
 ]
 
 foreach test, params: libsysprof_testsuite
-  test_exe = executable(test, '@0@.c'.format(test),
-          c_args: libsysprof_testsuite_c_args,
-    dependencies: libsysprof_testsuite_deps,
-  )
+  if params.get('cpp', false)
+    test_exe = executable(test, '@0@.cpp'.format(test),
+          cpp_args: libsysprof_testsuite_c_args,
+      dependencies: libsysprof_testsuite_deps,
+    )
+  else
+    test_exe = executable(test, '@0@.c'.format(test),
+            c_args: libsysprof_testsuite_c_args,
+      dependencies: libsysprof_testsuite_deps,
+    )
+  endif
+
   if not params.get('skip', false)
     test(test, test_exe, env: libsysprof_test_env)
   endif
diff --git a/src/libsysprof/tests/test-cplusplus.cpp b/src/libsysprof/tests/test-cplusplus.cpp
new file mode 100644
index 00000000..d23e57ec
--- /dev/null
+++ b/src/libsysprof/tests/test-cplusplus.cpp
@@ -0,0 +1,17 @@
+/*
+ * Copyright 2024 Simon McVittie
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include <sysprof.h>
+
+#undef _NDEBUG
+#include <assert.h>
+
+int
+main (G_GNUC_UNUSED int   argc,
+      G_GNUC_UNUSED char *argv[])
+{
+  assert (sysprof_callgraph_flags_get_type () != 0);
+  return 0;
+}