diff --git a/tests/test_base_parser.py b/tests/test_base_parser.py
index f62d134..5159799 100755
--- a/tests/test_base_parser.py
+++ b/tests/test_base_parser.py
@@ -20,7 +20,7 @@ class TestBaseParser(unittest.TestCase):
             pass
         with open(self._find_file("triad_x86_iaca.s")) as f:
             self.triad_code = f.read()
-        with open(self._find_file("triad_x86_intel.asm")) as f:
+        with open(self._find_file("triad_x86_intel.s")) as f:
             self.triad_code_intel = f.read()
         with open(self._find_file("triad_arm_iaca.s")) as f:
             self.triad_code_arm = f.read()
diff --git a/tests/test_files/gs_x86_icc.asm b/tests/test_files/gs_x86_icc.s
similarity index 100%
rename from tests/test_files/gs_x86_icc.asm
rename to tests/test_files/gs_x86_icc.s
diff --git a/tests/test_files/kernel_x86_intel.asm b/tests/test_files/kernel_x86_intel.s
similarity index 100%
rename from tests/test_files/kernel_x86_intel.asm
rename to tests/test_files/kernel_x86_intel.s
diff --git a/tests/test_files/kernel_x86_intel_memdep.asm b/tests/test_files/kernel_x86_intel_memdep.s
similarity index 100%
rename from tests/test_files/kernel_x86_intel_memdep.asm
rename to tests/test_files/kernel_x86_intel_memdep.s
diff --git a/tests/test_files/triad_x86_intel.asm b/tests/test_files/triad_x86_intel.s
similarity index 100%
rename from tests/test_files/triad_x86_intel.asm
rename to tests/test_files/triad_x86_intel.s
diff --git a/tests/test_files/triad_x86_intel_iaca.asm b/tests/test_files/triad_x86_intel_iaca.s
similarity index 100%
rename from tests/test_files/triad_x86_intel_iaca.asm
rename to tests/test_files/triad_x86_intel_iaca.s
diff --git a/tests/test_marker_utils.py b/tests/test_marker_utils.py
index 691280a..160bfe8 100755
--- a/tests/test_marker_utils.py
+++ b/tests/test_marker_utils.py
@@ -25,7 +25,7 @@ class TestMarkerUtils(unittest.TestCase):
             triad_code_arm = f.read()
         with open(self._find_file("triad_x86_iaca.s")) as f:
             triad_code_x86_att = f.read()
-        with open(self._find_file("triad_x86_intel_iaca.asm")) as f:
+        with open(self._find_file("triad_x86_intel_iaca.s")) as f:
             triad_code_x86_intel = f.read()
         self.parsed_AArch = self.parser_AArch.parse_file(triad_code_arm)
         self.parsed_x86_att = self.parser_x86_att.parse_file(triad_code_x86_att)
diff --git a/tests/test_parser_x86intel.py b/tests/test_parser_x86intel.py
index 5d52b9a..c95a070 100755
--- a/tests/test_parser_x86intel.py
+++ b/tests/test_parser_x86intel.py
@@ -21,11 +21,11 @@ class TestParserX86Intel(unittest.TestCase):
     @classmethod
     def setUpClass(self):
         self.parser = ParserX86Intel()
-        with open(self._find_file("triad_x86_intel.asm")) as f:
+        with open(self._find_file("triad_x86_intel.s")) as f:
             self.triad_code = f.read()
-        with open(self._find_file("triad_x86_intel_iaca.asm")) as f:
+        with open(self._find_file("triad_x86_intel_iaca.s")) as f:
             self.triad_iaca_code = f.read()
-        with open(self._find_file("gs_x86_icc.asm")) as f:
+        with open(self._find_file("gs_x86_icc.s")) as f:
             self.gs_icc_code = f.read()
 
     ##################
diff --git a/tests/test_semantics.py b/tests/test_semantics.py
index 7ff0748..46d38b4 100755
--- a/tests/test_semantics.py
+++ b/tests/test_semantics.py
@@ -41,9 +41,9 @@ class TestSemanticTools(unittest.TestCase):
             cls.code_x86_memdep = f.read()
         with open(cls._find_file("kernel_x86_long_LCD.s")) as f:
             cls.code_x86_long_LCD = f.read()
-        with open(cls._find_file("kernel_x86_intel.asm")) as f:
+        with open(cls._find_file("kernel_x86_intel.s")) as f:
             cls.code_x86_intel = f.read()
-        with open(cls._find_file("kernel_x86_intel_memdep.asm")) as f:
+        with open(cls._find_file("kernel_x86_intel_memdep.s")) as f:
             cls.code_x86_intel_memdep = f.read()
         with open(cls._find_file("kernel_aarch64_memdep.s")) as f:
             cls.code_aarch64_memdep = f.read()