diff --git a/src/alf.c b/src/alf.c
index af587000..c92190fc 100644
--- a/src/alf.c
+++ b/src/alf.c
@@ -3320,7 +3320,7 @@ void kvz_alf_create(videoframe_t *frame, enum kvz_chroma_format chroma_format)
       init_alf_covariance(&alf_info->alf_covariance_frame_chroma[k], chroma_coeffs);
     }
 
-    alf_info->alf_covariance_cc_alf[MAX_NUM_COMPONENT - 1] = malloc(num_ctus_in_pic * MAX_NUM_CC_ALF_FILTERS * (MAX_NUM_COMPONENT - 1) * sizeof(*alf_info->alf_covariance_cc_alf[MAX_NUM_COMPONENT - 1]));
+    alf_info->alf_covariance_cc_alf[MAX_NUM_COMPONENT - 1] = malloc(num_ctus_in_pic * MAX_NUM_CC_ALF_FILTERS * (MAX_NUM_COMPONENT - 1) * sizeof(alf_covariance));
     for (int comp_idx = 0; comp_idx < (MAX_NUM_COMPONENT - 1); comp_idx++)
     {
       alf_info->alf_covariance_cc_alf[comp_idx] = &alf_info->alf_covariance_cc_alf[MAX_NUM_COMPONENT - 1][comp_idx  * MAX_NUM_CC_ALF_FILTERS * num_ctus_in_pic];
@@ -3355,8 +3355,8 @@ void kvz_alf_create(videoframe_t *frame, enum kvz_chroma_format chroma_format)
   alf_info->best_filter_control = malloc(num_ctus_in_pic * sizeof(*alf_info->best_filter_control));
 
   // Classification
-  alf_info->classifier = malloc(pic_height * sizeof(**alf_info->classifier));
-  alf_info->classifier[0] = malloc(pic_height * pic_width * sizeof(*alf_info->classifier));
+  alf_info->classifier = malloc(pic_height * sizeof(alf_classifier*));
+  alf_info->classifier[0] = malloc(pic_height * pic_width * sizeof(alf_classifier));
 
   for (int i = 1; i < pic_height; i++)
   {
diff --git a/src/alf.h b/src/alf.h
index 4155c901..862b284d 100644
--- a/src/alf.h
+++ b/src/alf.h
@@ -166,13 +166,22 @@ typedef enum {
 //----------------------------------------------------------------
 
 //-------------------------typedef structs----------------------------
+#if defined(__MINGW32__) || defined(__MINGW64__) || defined(__linux__)
+#define PACK(__Declaration__) __Declaration__ __attribute__((__packed__))
+#else
+#define PACK(__Declaration__) __pragma(pack(push, 1)) __Declaration__ __pragma(pack(pop))
+#endif
+
+
+PACK(
 typedef struct alf_covariance {
+  double pix_acc;  
+  int64_t ee[MAX_ALF_NUM_CLIPPING_VALUES][MAX_ALF_NUM_CLIPPING_VALUES][MAX_NUM_ALF_LUMA_COEFF][MAX_NUM_ALF_LUMA_COEFF];
+  int32_t y[MAX_ALF_NUM_CLIPPING_VALUES][MAX_NUM_ALF_LUMA_COEFF];
   int num_coeff;
   int num_bins;
-  double y[MAX_ALF_NUM_CLIPPING_VALUES][MAX_NUM_ALF_LUMA_COEFF];
-  double ee[MAX_ALF_NUM_CLIPPING_VALUES][MAX_ALF_NUM_CLIPPING_VALUES][MAX_NUM_ALF_LUMA_COEFF][MAX_NUM_ALF_LUMA_COEFF];
-  double pix_acc;
-} alf_covariance;
+} alf_covariance;)
+
 
 typedef struct clp_rng {
   int min;
@@ -188,8 +197,8 @@ typedef struct clp_rngs {
 } clp_rngs;
 
 typedef struct alf_classifier {
-  int class_idx;
-  int transpose_idx;
+  uint8_t class_idx;
+  uint8_t transpose_idx;
 } alf_classifier;
 
 typedef struct cc_alf_filter_param {