diff --git a/Makefile b/Makefile
index 1c43645..52e91fa 100644
--- a/Makefile
+++ b/Makefile
@@ -7,6 +7,7 @@ SUDO_QEMU := sudo -u $(QEMU_USER)
 
 QEMUSH := /usr/local/bin/$(NAME)
 SRC_QEMUSH := bin/$(NAME)
+SRCD := src
 
 # This repo's equivalent of effective qemu Unix user home
 SRC_QEMU_HOME := qemu
@@ -26,9 +27,9 @@ BINS_MODE := 740
 CC := cc
 CC_OPTIONS = -O3
 # C sources file format
-SRC_FMT := c
+SRC_FMT := .c
 # Names of C programs to compile
-SRC_C_SOURCES_NAMES := $(notdir $(basename $(wildcard $(SRCD)/*.$(SRC_FMT))))
+SRC_C_SOURCES_NAMES := $(notdir $(basename $(wildcard $(SRCD)/*$(SRC_FMT))))
 # Location of C binaries
 C_BINARIES := $(addprefix $(QEMU_BIN)/,$(SRC_C_SOURCES_NAMES))
 
@@ -40,6 +41,7 @@ all: $(QEMUSH_DIRS) $(MODULES) $(C_BINARIES) $(QEMUSH)
 
 $(QEMUSH_DIRS):
 	$(SUDO_QEMU) mkdir -p $@
+	$(SUDO_QEMU) chmod 750 $@
 
 $(QEMUSH): $(SRC_QEMUSH)
 	sudo install -m 755 $^ $@
@@ -47,6 +49,6 @@ $(QEMUSH): $(SRC_QEMUSH)
 $(MODULES): $(QEMU_HOME)%: $(SRC_QEMU_HOME)%
 	$(SUDO_QEMU) install -m $(BINS_MODE) $^ $@
 
-$(C_BINARIES): $(QEMU_BIN)%: $(SRCD)/%.$(SRC_FMT)
-	$(SUDO_QEMU) $(QEMU_USER) $(CC) $(CC_OPTIONS) -o $@ $^
+$(C_BINARIES): $(QEMU_BIN)%: $(SRCD)%$(SRC_FMT)
+	$(SUDO_QEMU) $(CC) $(CC_OPTIONS) -o $@ $^
 	$(SUDO_QEMU) chmod $(BINS_MODE) $@