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/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;