diff --git a/tests/subsys/nrf_compress/decompression/arm_thumb/src/main.c b/tests/subsys/nrf_compress/decompression/arm_thumb/src/main.c
index a68dcedf77a2..d3e895ca7b79 100644
--- a/tests/subsys/nrf_compress/decompression/arm_thumb/src/main.c
+++ b/tests/subsys/nrf_compress/decompression/arm_thumb/src/main.c
@@ -18,6 +18,8 @@ static const uint8_t output_expected[] = {
 #include "arm_thumb.inc"
 };
 
+#define PLUS_MINUS_OUTPUT_SIZE 2
+
 ZTEST(nrf_compress_decompression, test_valid_implementation)
 {
 	int rc;
@@ -25,6 +27,7 @@ ZTEST(nrf_compress_decompression, test_valid_implementation)
 	uint32_t offset;
 	uint8_t *output;
 	uint32_t output_size;
+	uint32_t total_output_size = 0;
 	struct nrf_compress_implementation *implementation = NULL;
 
 	implementation = nrf_compress_implementation_find(NRF_COMPRESS_TYPE_ARM_THUMB);
@@ -36,6 +39,7 @@ ZTEST(nrf_compress_decompression, test_valid_implementation)
 
 	while (pos < sizeof(input_compressed)) {
 		uint32_t input_data_size;
+		bool last = false;
 
 		input_data_size = implementation->decompress_bytes_needed(NULL);
 		zassert_equal(input_data_size, CONFIG_NRF_COMPRESS_CHUNK_SIZE,
@@ -43,19 +47,28 @@ ZTEST(nrf_compress_decompression, test_valid_implementation)
 
 		if ((pos + input_data_size) >= sizeof(input_compressed)) {
 			input_data_size = sizeof(input_compressed) - pos;
+			last = true;
 		}
 
 		rc = implementation->decompress(NULL, &input_compressed[pos], input_data_size,
-						false, &offset, &output, &output_size);
+						last, &offset, &output, &output_size);
 
 		zassert_ok(rc, "Expected data decompress to be successful");
-		zassert_equal(output_size, input_data_size,
-			      "Expected data decompress to be successful");
 		zassert_mem_equal(output, &output_expected[pos], output_size);
 
+		if (!(output_size == input_data_size || output_size ==
+		      (input_data_size + PLUS_MINUS_OUTPUT_SIZE) || output_size ==
+		      (input_data_size - PLUS_MINUS_OUTPUT_SIZE))) {
+			zassert_ok(1, "Expected data output size is not valid");
+		}
+
 		pos += offset;
+		total_output_size += output_size;
 	}
 
+	zassert_equal(total_output_size, sizeof(output_expected),
+		      "Expected data decompress output size to match data input size");
+
 	rc = implementation->deinit(NULL);
 	zassert_ok(rc, "Expected deinit to be successful");
 }