diff --git a/CMakeLists.txt b/CMakeLists.txt
index abb188577..1b77161d2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -277,7 +277,7 @@ endif()
 # check for change in arch (32<->64)
 if(UNIX)
     GET_PROPERTY(DFHACK_CACHED_ARCH CACHE STRING PROPERTY DFHACK_BUILD_ARCH)
-	if(NOT "${DFHACK_BUILD_ARCH}" STREQUAL "${DFHACK_CACHED_ARCH}")
+    if(NOT "${DFHACK_BUILD_ARCH}" STREQUAL "${DFHACK_CACHED_ARCH}")
         unset(ZLIB_LIBRARY CACHE)
         unset(CMAKE_HAVE_PTHREAD_H CACHE)
     endif()
diff --git a/depends/protobuf/CMakeLists.txt b/depends/protobuf/CMakeLists.txt
index 9846fd4e5..59fe3f0d8 100644
--- a/depends/protobuf/CMakeLists.txt
+++ b/depends/protobuf/CMakeLists.txt
@@ -68,7 +68,7 @@ IF (HAVE_HASH_MAP EQUAL 0)
 ENDIF()
 
 IF(UNIX)
-	FIND_PACKAGE(Threads REQUIRED)
+    FIND_PACKAGE(Threads REQUIRED)
 ENDIF()
 
 CONFIGURE_FILE("${CMAKE_CURRENT_SOURCE_DIR}/config.h.in" "${CMAKE_CURRENT_BINARY_DIR}/config.h")