diff --git a/tests/test_fix_seed/test.sh b/tests/test_fix_seed/test.sh
index 377516ce..b1585a9f 100755
--- a/tests/test_fix_seed/test.sh
+++ b/tests/test_fix_seed/test.sh
@@ -1,12 +1,19 @@
 #!/bin/bash
 
-set -e
+Check_status() {
+	if [[ $? != 0 ]]; then
+		echo "error: test failed"
+		exit 1
+	fi
+}
 
 Check_difference() {
-	diff -q $1 $2
-	if [[ $? == 0 ]]; then
+	ret=$(diff -q $1 $2)
+	if [[ $ret == 0 ]]; then
 		echo "error: files must be different"
 		exit 1
+	else
+		echo
 	fi
 }
 
@@ -50,6 +57,7 @@ Check() {
 
 echo "Checking"
 verificarlo-c -O0 test.c -o test
+Check_status
 Check 53
 
 echo -e "\nsuccess"
diff --git a/tests/test_logger/test.sh b/tests/test_logger/test.sh
index c840b133..c4ea0497 100755
--- a/tests/test_logger/test.sh
+++ b/tests/test_logger/test.sh
@@ -1,7 +1,5 @@
 #!/bin/bash
 
-set -e
-
 OUTPUT_FILE=output
 ERROR_FILE=error
 
@@ -63,6 +61,10 @@ check_backend_info() {
 
 compile() {
     verificarlo test.c -o test
+    if [[ $? != 0 ]]; then
+        echo "Compilation failed"
+        exit 1
+    fi
 }
 
 run() {
diff --git a/tests/test_usercall_change_precision/test.sh b/tests/test_usercall_change_precision/test.sh
index 3b6971f9..334a9623 100755
--- a/tests/test_usercall_change_precision/test.sh
+++ b/tests/test_usercall_change_precision/test.sh
@@ -1,6 +1,11 @@
 #!/bin/bash
 
-set -e
+check_status() {
+    if [ $? -ne 0 ]; then
+        echo "Test fail"
+        exit 1
+    fi
+}
 
 clean() {
     rm -f *.log
@@ -8,6 +13,7 @@ clean() {
 
 clean
 verificarlo-c test.c -o test
+check_status
 
 VFC_BACKENDS="libinterflop_mca.so --precision-binary32 23 --seed=1234" ./test 0 0 >23.log 2>/dev/null
 VFC_BACKENDS="libinterflop_mca.so --precision-binary32 10 --seed=1234" ./test 0 0 >10.log 2>/dev/null
diff --git a/tests/test_usercall_inexact/Makefile b/tests/test_usercall_inexact/Makefile
new file mode 100644
index 00000000..839fbacd
--- /dev/null
+++ b/tests/test_usercall_inexact/Makefile
@@ -0,0 +1,17 @@
+ifndef type
+$(error type is not set)
+endif
+
+ifndef N
+$(error N is not set)
+endif
+
+CC=verificarlo-c
+CFLAGS=-Og -Wall -DREAL=$(type) -DN=$(N)
+LDFLAGS=
+SOURCE=test.c
+BINARY=test_$(type)
+
+all:
+	$(CC) $(CFLAGS) -c $(SOURCE) -o $(BINARY).o
+	$(CC) $(BINARY).o -o $(BINARY) $(LDFLAGS)
diff --git a/tests/test_usercall_inexact/test.sh b/tests/test_usercall_inexact/test.sh
index 10f7538b..a3a0921b 100755
--- a/tests/test_usercall_inexact/test.sh
+++ b/tests/test_usercall_inexact/test.sh
@@ -1,10 +1,15 @@
 #!/bin/bash
 
-set -e
-
 export VFC_BACKENDS_LOGGER=False
 export N=30
 
+check_status() {
+    if [[ $? != 0 ]]; then
+        echo "Test fail"
+        exit 1
+    fi
+}
+
 clean() {
     rm -f bfr.* aft.*
 }
@@ -26,7 +31,8 @@ run_test() {
 }
 
 # Move out compilation to faster test
-parallel --header : "verificarlo-c -Og test.c -DREAL={type} -DN=${N} -o test_{type}" ::: type float double
+parallel --header : "make --silent type={type} N=${N}" ::: type float double
+check_status
 
 clean
 for REAL in float double; do
diff --git a/verificarlo.in.in b/verificarlo.in.in
index 0fb679c2..fa009ac8 100644
--- a/verificarlo.in.in
+++ b/verificarlo.in.in
@@ -271,7 +271,7 @@ def compiler_mode(sources, options, output, args):
 
         if args.inst_func:
             # Apply function's instrumentation pass
-            if 13 <= int(llvm_version) <= 17:
+            if 13 <= int(llvm_version) < 17:
                 shell(
                     f"{opt} -S -enable-new-pm=0  -load {libvfcfuncinstrument} -vfclibfunc {ir.name} -o {ins.name}"
                 )