diff --git a/openmp/runtime/src/kmp_settings.cpp b/openmp/runtime/src/kmp_settings.cpp
--- a/openmp/runtime/src/kmp_settings.cpp
+++ b/openmp/runtime/src/kmp_settings.cpp
@@ -2535,6 +2535,11 @@
 signed := - signed
 -----------------------------------------------------------------------------*/
 
+// Warning to issue for syntax error during parsing of OMP_PLACES
+static inline void __kmp_omp_places_syntax_warn(const char *var) {
+  KMP_WARNING(SyntaxErrorUsing, var, "\"cores\"");
+}
+
 static int __kmp_parse_subplace_list(const char *var, const char **scan) {
   const char *next;
 
@@ -2546,7 +2551,7 @@
     //
     SKIP_WS(*scan);
     if ((**scan < '0') || (**scan > '9')) {
-      KMP_WARNING(SyntaxErrorUsing, var, "\"threads\"");
+      __kmp_omp_places_syntax_warn(var);
       return FALSE;
     }
     next = *scan;
@@ -2565,7 +2570,7 @@
       continue;
     }
     if (**scan != ':') {
-      KMP_WARNING(SyntaxErrorUsing, var, "\"threads\"");
+      __kmp_omp_places_syntax_warn(var);
       return FALSE;
     }
     (*scan)++; // skip ':'
@@ -2573,7 +2578,7 @@
     // Read count parameter
     SKIP_WS(*scan);
     if ((**scan < '0') || (**scan > '9')) {
-      KMP_WARNING(SyntaxErrorUsing, var, "\"threads\"");
+      __kmp_omp_places_syntax_warn(var);
       return FALSE;
     }
     next = *scan;
@@ -2592,7 +2597,7 @@
       continue;
     }
     if (**scan != ':') {
-      KMP_WARNING(SyntaxErrorUsing, var, "\"threads\"");
+      __kmp_omp_places_syntax_warn(var);
       return FALSE;
     }
     (*scan)++; // skip ':'
@@ -2614,7 +2619,7 @@
     }
     SKIP_WS(*scan);
     if ((**scan < '0') || (**scan > '9')) {
-      KMP_WARNING(SyntaxErrorUsing, var, "\"threads\"");
+      __kmp_omp_places_syntax_warn(var);
       return FALSE;
     }
     next = *scan;
@@ -2634,7 +2639,7 @@
       continue;
     }
 
-    KMP_WARNING(SyntaxErrorUsing, var, "\"threads\"");
+    __kmp_omp_places_syntax_warn(var);
     return FALSE;
   }
   return TRUE;
@@ -2651,7 +2656,7 @@
       return FALSE;
     }
     if (**scan != '}') {
-      KMP_WARNING(SyntaxErrorUsing, var, "\"threads\"");
+      __kmp_omp_places_syntax_warn(var);
       return FALSE;
     }
     (*scan)++; // skip '}'
@@ -2665,7 +2670,7 @@
     KMP_ASSERT(proc >= 0);
     *scan = next;
   } else {
-    KMP_WARNING(SyntaxErrorUsing, var, "\"threads\"");
+    __kmp_omp_places_syntax_warn(var);
     return FALSE;
   }
   return TRUE;
@@ -2693,7 +2698,7 @@
       continue;
     }
     if (*scan != ':') {
-      KMP_WARNING(SyntaxErrorUsing, var, "\"threads\"");
+      __kmp_omp_places_syntax_warn(var);
       return FALSE;
     }
     scan++; // skip ':'
@@ -2701,7 +2706,7 @@
     // Read count parameter
     SKIP_WS(scan);
     if ((*scan < '0') || (*scan > '9')) {
-      KMP_WARNING(SyntaxErrorUsing, var, "\"threads\"");
+      __kmp_omp_places_syntax_warn(var);
       return FALSE;
     }
     next = scan;
@@ -2720,7 +2725,7 @@
       continue;
     }
     if (*scan != ':') {
-      KMP_WARNING(SyntaxErrorUsing, var, "\"threads\"");
+      __kmp_omp_places_syntax_warn(var);
       return FALSE;
     }
     scan++; // skip ':'
@@ -2742,7 +2747,7 @@
     }
     SKIP_WS(scan);
     if ((*scan < '0') || (*scan > '9')) {
-      KMP_WARNING(SyntaxErrorUsing, var, "\"threads\"");
+      __kmp_omp_places_syntax_warn(var);
       return FALSE;
     }
     next = scan;
@@ -2762,7 +2767,7 @@
       continue;
     }
 
-    KMP_WARNING(SyntaxErrorUsing, var, "\"threads\"");
+    __kmp_omp_places_syntax_warn(var);
     return FALSE;
   }
 
@@ -2790,14 +2795,6 @@
     return;
   }
 
-  // If OMP_PROC_BIND is not specified but OMP_PLACES is,
-  // then let OMP_PROC_BIND default to true.
-  if (__kmp_nested_proc_bind.bind_types[0] == proc_bind_default) {
-    __kmp_nested_proc_bind.bind_types[0] = proc_bind_true;
-  }
-
-  //__kmp_affinity_num_places = 0;
-
   if (__kmp_match_str("threads", scan, &next)) {
     scan = next;
     __kmp_affinity_type = affinity_compact;
@@ -2833,9 +2830,14 @@
       __kmp_affinity_type = affinity_explicit;
       __kmp_affinity_gran = affinity_gran_fine;
       __kmp_affinity_dups = FALSE;
-      if (__kmp_nested_proc_bind.bind_types[0] == proc_bind_default) {
-        __kmp_nested_proc_bind.bind_types[0] = proc_bind_true;
-      }
+    } else {
+      // Syntax error fallback
+      __kmp_affinity_type = affinity_compact;
+      __kmp_affinity_gran = affinity_gran_core;
+      __kmp_affinity_dups = FALSE;
+    }
+    if (__kmp_nested_proc_bind.bind_types[0] == proc_bind_default) {
+      __kmp_nested_proc_bind.bind_types[0] = proc_bind_true;
     }
     return;
   }
diff --git a/openmp/runtime/test/affinity/omp-places-invalid-syntax.c b/openmp/runtime/test/affinity/omp-places-invalid-syntax.c
new file mode 100644
--- /dev/null
+++ b/openmp/runtime/test/affinity/omp-places-invalid-syntax.c
@@ -0,0 +1,11 @@
+// RUN: %libomp-compile && env KMP_SETTINGS=1 OMP_PLACES=invalid %libomp-run 2>&1 | FileCheck %s
+// CHECK-DAG: Effective settings
+// CHECK: OMP_PLACES=
+// CHECK-SAME: cores
+// REQUIRES: affinity
+
+int main() {
+  #pragma omp parallel
+  {}
+  return 0;
+}