diff --git a/src/coarse/coarse.c b/src/coarse/coarse.c
index 0ce4ded3d3..956e54857e 100644
--- a/src/coarse/coarse.c
+++ b/src/coarse/coarse.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2024 Intel Corporation
+ * Copyright (C) 2024-2025 Intel Corporation
  *
  * Under the Apache License v2.0 with LLVM Exceptions. See LICENSE.TXT.
  * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
@@ -278,7 +278,7 @@ static block_t *node_list_rm_first(ravl_free_blocks_head_t *head_node,
     assert(node->prev == NULL);
     struct block_t *block = node->block;
 
-    if (IS_NOT_ALIGNED(block->size, alignment)) {
+    if (IS_NOT_ALIGNED(((uintptr_t)block->data), alignment)) {
         return NULL;
     }
 
@@ -303,7 +303,7 @@ static block_t *node_list_rm_with_alignment(ravl_free_blocks_head_t *head_node,
 
     ravl_free_blocks_elem_t *node;
     for (node = head_node->head; node != NULL; node = node->next) {
-        if (IS_ALIGNED(node->block->size, alignment)) {
+        if (IS_ALIGNED(((uintptr_t)node->block->data), alignment)) {
             return node_list_rm(head_node, node);
         }
     }
diff --git a/test/coarse_lib.cpp b/test/coarse_lib.cpp
index c5e30ee8fc..a1aec224ae 100644
--- a/test/coarse_lib.cpp
+++ b/test/coarse_lib.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2024 Intel Corporation
+ * Copyright (C) 2024-2025 Intel Corporation
  *
  * Under the Apache License v2.0 with LLVM Exceptions. See LICENSE.TXT.
  * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
@@ -1349,3 +1349,48 @@ TEST_P(CoarseWithMemoryStrategyTest, coarseTest_alignment_fixed_memory) {
 
     coarse_delete(ch);
 }
+
+TEST_P(CoarseWithMemoryStrategyTest,
+       coarseTest_basic_non_aligned_fixed_memory) {
+    // preallocate some memory and initialize the vector with zeros
+    const size_t buff_size = 20 * MB + coarse_params.page_size;
+    std::vector<char> buffer(buff_size, 0);
+
+    void *buf_aligned = (void *)ALIGN_UP_SAFE((uintptr_t)buffer.data(),
+                                              coarse_params.page_size);
+    ASSERT_NE(buf_aligned, nullptr);
+
+    void *buf_non_aligned = (void *)((uintptr_t)buf_aligned + 64);
+    size_t buf_non_aligned_size =
+        buff_size - ((uintptr_t)buf_non_aligned - (uintptr_t)buffer.data());
+    buf_non_aligned_size =
+        ALIGN_DOWN(buf_non_aligned_size, coarse_params.page_size);
+
+    coarse_params.cb.alloc = NULL;
+    coarse_params.cb.free = NULL;
+
+    umf_result = coarse_new(&coarse_params, &coarse_handle);
+    ASSERT_EQ(umf_result, UMF_RESULT_SUCCESS);
+    ASSERT_NE(coarse_handle, nullptr);
+
+    coarse_t *ch = coarse_handle;
+    char *ptr = nullptr;
+
+    umf_result =
+        coarse_add_memory_fixed(ch, buf_non_aligned, buf_non_aligned_size);
+    ASSERT_EQ(umf_result, UMF_RESULT_SUCCESS);
+
+    ASSERT_EQ(coarse_get_stats(ch).used_size, 0 * MB);
+    ASSERT_EQ(coarse_get_stats(ch).alloc_size, buf_non_aligned_size);
+    ASSERT_EQ(coarse_get_stats(ch).num_all_blocks, 1);
+
+    umf_result = coarse_alloc(ch, buf_non_aligned_size, 0, (void **)&ptr);
+    ASSERT_EQ(umf_result, UMF_RESULT_ERROR_OUT_OF_HOST_MEMORY);
+    ASSERT_EQ(ptr, nullptr);
+
+    ASSERT_EQ(coarse_get_stats(ch).used_size, 0 * MB);
+    ASSERT_EQ(coarse_get_stats(ch).alloc_size, buf_non_aligned_size);
+    ASSERT_EQ(coarse_get_stats(ch).num_all_blocks, 1);
+
+    coarse_delete(ch);
+}