diff --git a/ggml-quants.c b/ggml-quants.c
index eef36e962..bb0556485 100644
--- a/ggml-quants.c
+++ b/ggml-quants.c
@@ -9651,7 +9651,7 @@ static int iq2_find_best_neighbour(const uint16_t * restrict neighbours, const u
 
 static void quantize_row_iq2_xxs_impl(const float * restrict x, void * restrict vy, int n, const float * restrict quant_weights) {
 
-    const int gindex = iq2_data_index(256);
+    const int gindex = iq2_data_index(GGML_TYPE_IQ2_XXS);
 
     const uint64_t * kgrid_q2xs      = iq2_data[gindex].grid;
     const int      * kmap_q2xs       = iq2_data[gindex].map;
@@ -9824,7 +9824,7 @@ static void quantize_row_iq2_xxs_impl(const float * restrict x, void * restrict
 
 static void quantize_row_iq2_xs_impl(const float * restrict x, void * restrict vy, int n, const float * restrict quant_weights) {
 
-    const int gindex = iq2_data_index(512);
+    const int gindex = iq2_data_index(GGML_TYPE_IQ2_XS);
 
     const uint64_t * kgrid_q2xs      = iq2_data[gindex].grid;
     const int      * kmap_q2xs       = iq2_data[gindex].map;
diff --git a/ggml.c b/ggml.c
index ee5a60e18..c5b390711 100644
--- a/ggml.c
+++ b/ggml.c
@@ -19209,7 +19209,8 @@ size_t ggml_quantize_q8_0(const float * src, void * dst, int n, int k, int64_t *
 bool ggml_quantize_requires_imatrix(enum ggml_type type) {
     return
         type == GGML_TYPE_IQ2_XXS ||
-        type == GGML_TYPE_IQ2_XS;
+        type == GGML_TYPE_IQ2_XS  ||
+        type == GGML_TYPE_IQ1_S;
 }
 
 size_t ggml_quantize_chunk(enum ggml_type type, const float * src, void * dst, int start,