diff --git a/Makefile b/Makefile
index a3d1a86..8057669 100644
--- a/Makefile
+++ b/Makefile
@@ -6,7 +6,7 @@ CARGO_FLAGS = --release
 BOSSA_FLAGS = -ewvRo 0x2000
 
 TARGET_DIR  = target
-TARGET_ARCH = $(shell grep -oP '^target\s+=\s"\K[\w\-]+' $(CARGO_CONF))
+TARGET_ARCH = $(shell grep -oP '^target\s+=\s+"\K[\w\-]+' $(CARGO_CONF))
 
 CARGO_BIN   = $(TARGET_DIR)/$(TARGET_ARCH)/release/onyx
 FLASH_IMG   = $(TARGET_DIR)/onyx.bin