diff --git a/backend/go/stablediffusion-ggml/Makefile b/backend/go/stablediffusion-ggml/Makefile
index 51f087141..9aa74c27f 100644
--- a/backend/go/stablediffusion-ggml/Makefile
+++ b/backend/go/stablediffusion-ggml/Makefile
@@ -8,7 +8,7 @@ JOBS?=$(shell nproc --ignore=1)
 
 # stablediffusion.cpp (ggml)
 STABLEDIFFUSION_GGML_REPO?=https://github.com/leejet/stable-diffusion.cpp
-STABLEDIFFUSION_GGML_VERSION?=b0179181069254389ccad604e44f17a2c25b4094
+STABLEDIFFUSION_GGML_VERSION?=fce6afcc6a3250a8e17923608922d2a99b339b47
 
 CMAKE_ARGS+=-DGGML_MAX_NAME=128
 
diff --git a/backend/go/stablediffusion-ggml/gosd.cpp b/backend/go/stablediffusion-ggml/gosd.cpp
index b2026fdb3..4a2e01da4 100644
--- a/backend/go/stablediffusion-ggml/gosd.cpp
+++ b/backend/go/stablediffusion-ggml/gosd.cpp
@@ -43,6 +43,8 @@ const char* sample_method_str[] = {
     "tcd",
 };
 
+static_assert(std::size(sample_method_str) == SAMPLE_METHOD_COUNT, "sample method mismatch");
+
 // Names of the sigma schedule overrides, same order as sample_schedule in stable-diffusion.h
 const char* schedulers[] = {
     "default",
@@ -51,8 +53,11 @@ const char* schedulers[] = {
     "exponential",
     "ays",
     "gits",
+    "smoothstep",
 };
 
+static_assert(std::size(schedulers) == SCHEDULE_COUNT, "schedulers mismatch");
+
 sd_ctx_t* sd_c;
 // Moved from the context (load time) to generation time params
 scheduler_t scheduler = scheduler_t::DEFAULT;