diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3d24caf..68cf920 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -52,8 +52,8 @@ set(JSON_C_HEADERS
     ./linkhash.h
     ./math_compat.h
     ./strdup_compat.h
-	./strerror_override.h
-	./strerror_override_private.h
+    ./strerror_override.h
+    ./strerror_override_private.h
     ./vasprintf_compat.h
     ./printbuf.h
     ./random_seed.h
@@ -68,7 +68,7 @@ set(JSON_C_SOURCES
     ./json_util.c
     ./linkhash.c
     ./printbuf.c
-	./strerror_override.c
+    ./strerror_override.c
     ./random_seed.c
     ./strerror_override.c
 )