diff --git a/openmp/libomptarget/DeviceRTL/include/Debug.h b/openmp/libomptarget/DeviceRTL/include/Debug.h
--- a/openmp/libomptarget/DeviceRTL/include/Debug.h
+++ b/openmp/libomptarget/DeviceRTL/include/Debug.h
@@ -16,12 +16,14 @@
 ///
 /// {
 extern "C" {
-void __assert_assume(bool cond, const char *exp, const char *file, int line);
+void __assert_assume(bool cond, const char *assertion, const char *file,
+                     int line, const char *function);
 void __assert_fail(const char *assertion, const char *file, unsigned line,
                    const char *function);
 }
 
-#define ASSERT(e) __assert_assume(e, #e, __FILE__, __LINE__)
+#define ASSERT(e)                                                              \
+  __assert_assume(e, #e, __FILE__, __LINE__, __PRETTY_FUNCTION__)
 
 ///}
 
diff --git a/openmp/libomptarget/DeviceRTL/src/Debug.cpp b/openmp/libomptarget/DeviceRTL/src/Debug.cpp
--- a/openmp/libomptarget/DeviceRTL/src/Debug.cpp
+++ b/openmp/libomptarget/DeviceRTL/src/Debug.cpp
@@ -21,13 +21,15 @@
 #pragma omp declare target
 
 extern "C" {
-void __assert_assume(bool cond, const char *exp, const char *file, int line) {
-  if (!cond && config::isDebugMode(config::DebugKind::Assertion)) {
-    PRINTF("ASSERTION failed: %s at %s, line %d\n", exp, file, line);
+void __assert_assume(bool condition, const char *assertion, const char *file,
+                     int line, const char *function) {
+  if (config::isDebugMode(config::DebugKind::Assertion) && !condition) {
+    PRINTF("%s:%u: %s: Assertion `%s' failed.\n", file, line, function,
+           assertion);
     __builtin_trap();
   }
 
-  __builtin_assume(cond);
+  __builtin_assume(condition);
 }
 
 void __assert_fail(const char *assertion, const char *file, unsigned line,