diff --git a/iop/scripts/genconfig.sh b/iop/scripts/genconfig.sh
index 5df1f9580..6d21bb468 100755
--- a/iop/scripts/genconfig.sh
+++ b/iop/scripts/genconfig.sh
@@ -298,6 +298,24 @@ function genconfig {
 		fi
 	}
 
+	get_subtarget_for_device() {
+		readonly target="$1"
+		readonly device="$2"
+		readonly targetinfo_file="tmp/info/.targetinfo-feeds_$target"
+		readonly target_profile_line="Target-Profile: DEVICE_$device"
+		# We want to know after which Target: $target/$subtarget line
+		# our $target_profile_line appears
+		# This is a crude way to "parse" the file using shell 🤯
+		# 1. grep for both lines with line number output
+		# 2. grep again to determine the device profile line that we looked for
+		#    but output one context line before as well to determine corresponding subtarget line
+		# 4. Use head and sed to extract the subtarget
+		grep "^Target: $target/\|^$target_profile_line" "$targetinfo_file" \
+			| grep -E -B1 "^$target_profile_line" \
+			| head -n1 \
+			| sed -E "s|^Target: $target/||"
+	}
+
 	create_and_copy_files()
 	{
 		local BOARDTYPE=$1
@@ -345,12 +363,11 @@ function genconfig {
 		airoha | iopsys_mediatek | brcmbca | ipq95xx)
 			# This assumes the device name to be unique within one target,
 			# which is a fair assumption to make.
-			local mk_file="$(grep -Fx --files-with-matches "define Device/${BOARDTYPE}" "$target_config_path/../image/"*.mk)"
-			if [ -z "$mk_file" ]; then
+			local subtarget="$(get_subtarget_for_device "$target" "$BOARDTYPE")"
+			if [ -z "$subtarget" ]; then
 				echo "Error determining subtarget for $target / ${BOARDTYPE}"
 				return 1
 			fi
-			local subtarget="$(basename "${mk_file%.mk}")"
 			echo "CONFIG_TARGET_${target}=y" >> .config
 			echo "CONFIG_TARGET_${target}_${subtarget}=y" >> .config
 			echo "CONFIG_TARGET_DEVICE_${target}_${subtarget}_DEVICE_${BOARDTYPE}=y" >> .config
diff --git a/iop/scripts/genconfig_min.sh b/iop/scripts/genconfig_min.sh
index d46219603..ffc3ab6ba 100644
--- a/iop/scripts/genconfig_min.sh
+++ b/iop/scripts/genconfig_min.sh
@@ -272,6 +272,24 @@ function genconfig_min {
 		fi
 	}
 
+	get_subtarget_for_device() {
+		readonly target="$1"
+		readonly device="$2"
+		readonly targetinfo_file="tmp/info/.targetinfo-feeds_$target"
+		readonly target_profile_line="Target-Profile: DEVICE_$device"
+		# We want to know after which Target: $target/$subtarget line
+		# our $target_profile_line appears
+		# This is a crude way to "parse" the file using shell 🤯
+		# 1. grep for both lines with line number output
+		# 2. grep again to determine the device profile line that we looked for
+		#    but output one context line before as well to determine corresponding subtarget line
+		# 4. Use head and sed to extract the subtarget
+		grep "^Target: $target/\|^$target_profile_line" "$targetinfo_file" \
+			| grep -E -B1 "^$target_profile_line" \
+			| head -n1 \
+			| sed -E "s|^Target: $target/||"
+	}
+
 	create_and_copy_files()
 	{
 		local BOARDTYPE=$1
@@ -316,15 +334,14 @@ function genconfig_min {
 
 		# Special handling for targets which use TARGET_DEVICES
 		case "$target" in
-			airoha | iopsys_mediatek | brcmbca | ipq95xx)
+		airoha | iopsys_mediatek | brcmbca | ipq95xx)
 			# This assumes the device name to be unique within one target,
 			# which is a fair assumption to make.
-			local mk_file="$(grep -Fx --files-with-matches "define Device/${BOARDTYPE}" "$target_config_path/../image/"*.mk)"
-			if [ -z "$mk_file" ]; then
+			local subtarget="$(get_subtarget_for_device "$target" "$BOARDTYPE")"
+			if [ -z "$subtarget" ]; then
 				echo "Error determining subtarget for $target / ${BOARDTYPE}"
 				return 1
 			fi
-			local subtarget="$(basename "${mk_file%.mk}")"
 			echo "CONFIG_TARGET_${target}=y" >> .config
 			echo "CONFIG_TARGET_${target}_${subtarget}=y" >> .config
 			echo "CONFIG_TARGET_DEVICE_${target}_${subtarget}_DEVICE_${BOARDTYPE}=y" >> .config