diff --git a/projects/Makefile.am b/projects/Makefile.am
index 8b6d4dc4b2..bf7f3a05ab 100644
--- a/projects/Makefile.am
+++ b/projects/Makefile.am
@@ -50,7 +50,7 @@ CS_1 =
 CS_ = $(CS_0)
 
 checksrc:
-	$(CHECKSRC)(@PERL@ $(top_srcdir)/scripts/checksrc.pl -D$(srcdir) $(srcdir)/OS400/*.[ch])
+	$(CHECKSRC)(@PERL@ $(top_srcdir)/scripts/checksrc.pl -D$(srcdir)/OS400 $(srcdir)/OS400/*.[ch])
 
 if NOT_CURL_CI
 if DEBUGBUILD
diff --git a/tests/libtest/Makefile.am b/tests/libtest/Makefile.am
index e174698a32..db7c9d741b 100644
--- a/tests/libtest/Makefile.am
+++ b/tests/libtest/Makefile.am
@@ -81,9 +81,7 @@ CS_ = $(CS_0)
 
 # ignore generated C files since they play by slightly different rules!
 checksrc: lib1521.c
-	$(CHECKSRC)(@PERL@ $(top_srcdir)/scripts/checksrc.pl -D$(srcdir) \
-	  -W$(srcdir)/$(BUNDLE).c \
-	  $(srcdir)/*.[ch])
+	$(CHECKSRC)(@PERL@ $(top_srcdir)/scripts/checksrc.pl -D$(srcdir) -W$(srcdir)/$(BUNDLE).c $(FIRST_C) $(FIRST_H) $(UTILS_C) $(UTILS_H) $(TESTS_C))
 
 if NOT_CURL_CI
 all-local: checksrc
diff --git a/tests/server/Makefile.am b/tests/server/Makefile.am
index fe0a15eaec..5427c6df0b 100644
--- a/tests/server/Makefile.am
+++ b/tests/server/Makefile.am
@@ -62,11 +62,8 @@ CS_0 = @echo "  RUN     " $@;
 CS_1 =
 CS_ = $(CS_0)
 
-# ignore generated C files since they play by slightly different rules!
 checksrc:
-	$(CHECKSRC)(@PERL@ $(top_srcdir)/scripts/checksrc.pl -D$(srcdir) \
-	  -W$(srcdir)/$(BUNDLE).c \
-	  $(srcdir)/*.[ch])
+	$(CHECKSRC)(@PERL@ $(top_srcdir)/scripts/checksrc.pl -D$(srcdir) -W$(srcdir)/$(BUNDLE).c $(FIRST_C) $(FIRST_H) $(UTILS_C) $(UTILS_H) $(TESTS_C))
 
 if NOT_CURL_CI
 all-local: checksrc
diff --git a/tests/tunit/Makefile.am b/tests/tunit/Makefile.am
index ac7e31adee..c45a4b908b 100644
--- a/tests/tunit/Makefile.am
+++ b/tests/tunit/Makefile.am
@@ -71,11 +71,8 @@ CS_0 = @echo "  RUN     " $@;
 CS_1 =
 CS_ = $(CS_0)
 
-# ignore generated C files since they play by slightly different rules!
 checksrc:
-	$(CHECKSRC)(@PERL@ $(top_srcdir)/scripts/checksrc.pl -D$(srcdir) \
-	  -W$(srcdir)/$(BUNDLE).c \
-	  $(srcdir)/*.[ch])
+	$(CHECKSRC)(@PERL@ $(top_srcdir)/scripts/checksrc.pl -D$(srcdir) -W$(srcdir)/$(BUNDLE).c $(TESTS_C))
 
 if NOT_CURL_CI
 all-local: checksrc
diff --git a/tests/unit/Makefile.am b/tests/unit/Makefile.am
index 5c87bf9ae5..34fbbf8f5f 100644
--- a/tests/unit/Makefile.am
+++ b/tests/unit/Makefile.am
@@ -75,11 +75,8 @@ CS_0 = @echo "  RUN     " $@;
 CS_1 =
 CS_ = $(CS_0)
 
-# ignore generated C files since they play by slightly different rules!
 checksrc:
-	$(CHECKSRC)(@PERL@ $(top_srcdir)/scripts/checksrc.pl -D$(srcdir) \
-	  -W$(srcdir)/$(BUNDLE).c \
-	  $(srcdir)/*.[ch])
+	$(CHECKSRC)(@PERL@ $(top_srcdir)/scripts/checksrc.pl -D$(srcdir) -W$(srcdir)/$(BUNDLE).c $(TESTS_C))
 
 if NOT_CURL_CI
 all-local: checksrc