diff --git a/pipewire-pulseaudio/src/context.c b/pipewire-pulseaudio/src/context.c
index 0ebea4ef7..9784141d4 100644
--- a/pipewire-pulseaudio/src/context.c
+++ b/pipewire-pulseaudio/src/context.c
@@ -29,12 +29,13 @@
 
 #include "internal.h"
 
-int pa_context_set_error(pa_context *c, int error) {
+int pa_context_set_error(PA_CONST pa_context *c, int error) {
 	pa_assert(error >= 0);
 	pa_assert(error < PA_ERR_MAX);
 	if (c && c->error != error) {
 		pw_log_debug("context %p: error %d %s", c, error, pa_strerror(error));
-		c->error = error;
+		((pa_context*)c)->error = error;
+
 	}
 	return error;
 }
diff --git a/pipewire-pulseaudio/src/internal.h b/pipewire-pulseaudio/src/internal.h
index fd80d8b8a..c9feb26a4 100644
--- a/pipewire-pulseaudio/src/internal.h
+++ b/pipewire-pulseaudio/src/internal.h
@@ -127,7 +127,7 @@ static inline const char *pa_strnull(const char *x) {
     return x ? x : "(null)";
 }
 
-int pa_context_set_error(pa_context *c, int error);
+int pa_context_set_error(PA_CONST pa_context *c, int error);
 
 #define PA_CHECK_VALIDITY(context, expression, error)			\
 do {									\