diff --git a/ggml-backend.c b/ggml-backend.c
index 87eea8440..d019d813a 100644
--- a/ggml-backend.c
+++ b/ggml-backend.c
@@ -1006,6 +1006,7 @@ static int ggml_backend_sched_backend_from_buffer(ggml_backend_sched_t sched, gg
         }
     }
     GGML_ASSERT(false && "tensor buffer type not supported by any backend");
+    return -1; // silence warning
 }
 
 #if 0
diff --git a/ggml.c b/ggml.c
index cb3e32c0d..31691ad75 100644
--- a/ggml.c
+++ b/ggml.c
@@ -18576,7 +18576,9 @@ static enum ggml_opt_result linesearch_backtracking(
         (*step) *= width;
     }
 
-    GGML_UNREACHABLE();
+    GGML_ASSERT(false && "line search failed");
+
+    return GGML_LINESEARCH_FAIL;
 }
 
 static enum ggml_opt_result ggml_opt_lbfgs(
@@ -18844,7 +18846,9 @@ static enum ggml_opt_result ggml_opt_lbfgs(
         step[0] = 1.0;
     }
 
-    GGML_UNREACHABLE();
+    GGML_ASSERT(false && "lbfgs failed");
+
+    return GGML_OPT_DID_NOT_CONVERGE;
 }
 
 struct ggml_opt_params ggml_opt_default_params(enum ggml_opt_type type) {