diff --git a/recipes-extended/m4projects/files/shutdown-stm32mp1-m4.sh b/recipes-extended/m4projects/files/shutdown-stm32mp1-m4.sh
index 35ffe0b..af66d9c 100755
--- a/recipes-extended/m4projects/files/shutdown-stm32mp1-m4.sh
+++ b/recipes-extended/m4projects/files/shutdown-stm32mp1-m4.sh
@@ -1,7 +1,7 @@
 #!/bin/sh -
 
 # test if we are a stm32mp1
-if ! $(grep -q "stm32mp157[acdf]-dk\|ev" /proc/device-tree/compatible) ;
+if ! $(grep -q "stm32mp157[acdf]-\(dk\|ev\)" /proc/device-tree/compatible) ;
 then
     exit 0
 fi
diff --git a/recipes-extended/m4projects/m4projects.inc b/recipes-extended/m4projects/m4projects.inc
index 7d5882b..741d2b0 100644
--- a/recipes-extended/m4projects/m4projects.inc
+++ b/recipes-extended/m4projects/m4projects.inc
@@ -37,7 +37,7 @@ BUILD_CONFIG ?= "Debug"
 
 # Init default installation path
 M4_FOLDER ?= "Cube-M4-examples"
-M4_INSTALLDIR ?= "${prefix}local"
+M4_INSTALLDIR ?= "${prefix}/local"
 M4_OUTPUT_4USERFS = "${M4_INSTALLDIR}/${M4_FOLDER}"
 
 # Use gcc bare toolchain