diff --git a/src/pulsecore/hashmap.c b/src/pulsecore/hashmap.c
index c03af3bc8..c2fc3f5ea 100644
--- a/src/pulsecore/hashmap.c
+++ b/src/pulsecore/hashmap.c
@@ -173,7 +173,7 @@ int pa_hashmap_put(pa_hashmap *h, void *key, void *value) {
     return 0;
 }
 
-void* pa_hashmap_get(pa_hashmap *h, const void *key) {
+void* pa_hashmap_get(const pa_hashmap *h, const void *key) {
     unsigned hash;
     struct hashmap_entry *e;
 
diff --git a/src/pulsecore/hashmap.h b/src/pulsecore/hashmap.h
index ea883765b..c18a564f2 100644
--- a/src/pulsecore/hashmap.h
+++ b/src/pulsecore/hashmap.h
@@ -45,7 +45,7 @@ void pa_hashmap_free(pa_hashmap*);
 int pa_hashmap_put(pa_hashmap *h, void *key, void *value);
 
 /* Return an entry from the hashmap */
-void* pa_hashmap_get(pa_hashmap *h, const void *key);
+void* pa_hashmap_get(const pa_hashmap *h, const void *key);
 
 /* Returns the data of the entry while removing */
 void* pa_hashmap_remove(pa_hashmap *h, const void *key);