diff --git a/test/err/Makefile b/test/err/Makefile
index a6d590515..46ce4c9cc 100644
--- a/test/err/Makefile
+++ b/test/err/Makefile
@@ -20,6 +20,7 @@ WORKDIR := ./../../testwrk
 .PHONY: all clean
 
 SOURCES := $(wildcard *.c)
+
 TESTS := $(SOURCES:%.c=$(WORKDIR)/%.prg)
 TESTS += $(SOURCES:%.c=$(WORKDIR)/%.o.prg)
 TESTS += $(SOURCES:%.c=$(WORKDIR)/%.os.prg)
diff --git a/test/misc/Makefile b/test/misc/Makefile
index 7af8c0cb1..64fcc8759 100644
--- a/test/misc/Makefile
+++ b/test/misc/Makefile
@@ -24,6 +24,7 @@ DIFF := $(WORKDIR)/bdiff
 .PHONY: all clean
 
 SOURCES := $(wildcard *.c)
+
 TESTS := $(SOURCES:%.c=$(WORKDIR)/%.prg)
 TESTS += $(SOURCES:%.c=$(WORKDIR)/%.o.prg)
 TESTS += $(SOURCES:%.c=$(WORKDIR)/%.os.prg)
@@ -61,5 +62,3 @@ clean:
 	@$(RM) $(TESTS)
 	@$(RM) $(SOURCES:.c=.o)
 	@$(RM) $(SOURCES:%.c=$(WORKDIR)/%.out)
-
-
diff --git a/test/ref/Makefile b/test/ref/Makefile
index 39336aa52..df13a28cc 100644
--- a/test/ref/Makefile
+++ b/test/ref/Makefile
@@ -26,9 +26,10 @@ CFLAGS := -O2 -Wall -W -Wextra -fwrapv -fno-strict-overflow
 
 .PHONY: all clean
 
-REFS := $(patsubst %.c,$(WORKDIR)/%.ref,$(wildcard *.c))
-
 SOURCES := $(wildcard *.c)
+
+REFS := $(SOURCES:%.c=$(WORKDIR)/%.ref)
+
 TESTS := $(SOURCES:%.c=$(WORKDIR)/%.prg)
 TESTS += $(SOURCES:%.c=$(WORKDIR)/%.o.prg)
 TESTS += $(SOURCES:%.c=$(WORKDIR)/%.os.prg)
diff --git a/test/val/Makefile b/test/val/Makefile
index c9afbbd86..f4e0d28b2 100644
--- a/test/val/Makefile
+++ b/test/val/Makefile
@@ -22,6 +22,7 @@ WORKDIR := ./../../testwrk
 .PHONY: all clean
 
 SOURCES := $(wildcard *.c)
+
 TESTS := $(SOURCES:%.c=$(WORKDIR)/%.prg)
 TESTS += $(SOURCES:%.c=$(WORKDIR)/%.o.prg)
 TESTS += $(SOURCES:%.c=$(WORKDIR)/%.os.prg)