diff --git a/src/libexpr/local.mk b/src/libexpr/local.mk
index ed6bc761a..b60936a0e 100644
--- a/src/libexpr/local.mk
+++ b/src/libexpr/local.mk
@@ -18,7 +18,7 @@ libexpr_LIBS = libutil libstore libfetchers
 
 libexpr_LDFLAGS += -lboost_context -pthread
 ifdef HOST_LINUX
- libexpr_LDFLAGS += -ldl
+  libexpr_LDFLAGS += -ldl
 endif
 
 # The dependency on libgc must be propagated (i.e. meaning that
diff --git a/src/libstore/local.mk b/src/libstore/local.mk
index 675976314..f447e190d 100644
--- a/src/libstore/local.mk
+++ b/src/libstore/local.mk
@@ -16,15 +16,15 @@ endif
 $(foreach file,$(libstore_FILES),$(eval $(call install-data-in,$(d)/$(file),$(datadir)/nix/sandbox)))
 
 ifeq ($(ENABLE_S3), 1)
-	libstore_LDFLAGS += -laws-cpp-sdk-transfer -laws-cpp-sdk-s3 -laws-cpp-sdk-core -laws-crt-cpp
+  libstore_LDFLAGS += -laws-cpp-sdk-transfer -laws-cpp-sdk-s3 -laws-cpp-sdk-core -laws-crt-cpp
 endif
 
 ifdef HOST_SOLARIS
-	libstore_LDFLAGS += -lsocket
+  libstore_LDFLAGS += -lsocket
 endif
 
 ifeq ($(HAVE_SECCOMP), 1)
-	libstore_LDFLAGS += $(LIBSECCOMP_LIBS)
+  libstore_LDFLAGS += $(LIBSECCOMP_LIBS)
 endif
 
 libstore_CXXFLAGS += \
@@ -48,9 +48,9 @@ $(d)/embedded-sandbox-shell.gen.hh: $(sandbox_shell)
 	$(trace-gen) hexdump -v -e '1/1 "0x%x," "\n"' < $< > $@.tmp
 	@mv $@.tmp $@
 else
-ifneq ($(sandbox_shell),)
-libstore_CXXFLAGS += -DSANDBOX_SHELL="\"$(sandbox_shell)\""
-endif
+  ifneq ($(sandbox_shell),)
+    libstore_CXXFLAGS += -DSANDBOX_SHELL="\"$(sandbox_shell)\""
+  endif
 endif
 
 $(d)/local-store.cc: $(d)/schema.sql.gen.hh $(d)/ca-specific-schema.sql.gen.hh
diff --git a/src/libutil/local.mk b/src/libutil/local.mk
index 0fdebaf5c..6e3d6d052 100644
--- a/src/libutil/local.mk
+++ b/src/libutil/local.mk
@@ -17,5 +17,5 @@ $(foreach i, $(wildcard $(d)/signature/*.hh), \
 
 
 ifeq ($(HAVE_LIBCPUID), 1)
-	libutil_LDFLAGS += -lcpuid
+  libutil_LDFLAGS += -lcpuid
 endif
diff --git a/tests/functional/local.mk b/tests/functional/local.mk
index 192e275e3..25fcbcfe7 100644
--- a/tests/functional/local.mk
+++ b/tests/functional/local.mk
@@ -129,15 +129,15 @@ nix_tests = \
   impure-env.sh
 
 ifeq ($(HAVE_LIBCPUID), 1)
-	nix_tests += compute-levels.sh
+  nix_tests += compute-levels.sh
 endif
 
 ifeq ($(ENABLE_BUILD), yes)
-	nix_tests += test-libstoreconsumer.sh
+  nix_tests += test-libstoreconsumer.sh
 
-	ifeq ($(BUILD_SHARED_LIBS), 1)
-		nix_tests += plugins.sh
-	endif
+  ifeq ($(BUILD_SHARED_LIBS), 1)
+    nix_tests += plugins.sh
+  endif
 endif
 
 $(d)/test-libstoreconsumer.sh.test $(d)/test-libstoreconsumer.sh.test-debug: \