diff --git a/src/include/stage_cache.h b/src/include/stage_cache.h
index 5a4c16a5e7..68cfdb7e41 100644
--- a/src/include/stage_cache.h
+++ b/src/include/stage_cache.h
@@ -30,7 +30,7 @@ enum {
 };
 
 /* Cache the loaded stage provided according to the parameters. */
-void stage_cache_add(int stage_id, struct prog *stage);
+void stage_cache_add(int stage_id, const struct prog *stage);
 /* Load the cached stage at given location returning the stage entry point. */
 void stage_cache_load_stage(int stage_id, struct prog *stage);
 /* Fill in parameters for the external stage cache, if utilized. */
diff --git a/src/lib/cbmem_stage_cache.c b/src/lib/cbmem_stage_cache.c
index 4a114438bb..eb5e2b3247 100644
--- a/src/lib/cbmem_stage_cache.c
+++ b/src/lib/cbmem_stage_cache.c
@@ -23,7 +23,7 @@
 #include <string.h>
 
 /* Stage cache uses cbmem. */
-void stage_cache_add(int stage_id, struct prog *stage)
+void stage_cache_add(int stage_id, const struct prog *stage)
 {
 	struct stage_cache *meta;
 	void *c;
diff --git a/src/lib/ext_stage_cache.c b/src/lib/ext_stage_cache.c
index 4e588f1c01..bbadb70dd4 100644
--- a/src/lib/ext_stage_cache.c
+++ b/src/lib/ext_stage_cache.c
@@ -62,7 +62,7 @@ static void stage_cache_recover(void)
 		printk(BIOS_DEBUG, "Unable to recover external stage cache.\n");
 }
 
-void stage_cache_add(int stage_id, struct prog *stage)
+void stage_cache_add(int stage_id, const struct prog *stage)
 {
 	struct imd *imd;
 	const struct imd_entry *e;
diff --git a/src/lib/prog_loaders.c b/src/lib/prog_loaders.c
index 7c00abad71..2f4a2c118a 100644
--- a/src/lib/prog_loaders.c
+++ b/src/lib/prog_loaders.c
@@ -60,7 +60,8 @@ fail:
 	halt();
 }
 
-void __attribute__((weak)) stage_cache_add(int stage_id, struct prog *stage) {}
+void __attribute__((weak)) stage_cache_add(int stage_id,
+						const struct prog *stage) {}
 void __attribute__((weak)) stage_cache_load_stage(int stage_id,
 							struct prog *stage) {}
 void __attribute__((weak)) ramstage_cache_invalid(void) {}