diff --git a/src/system/libroot/posix/malloc/openbsd/PagesAllocator.cpp b/src/system/libroot/posix/malloc/openbsd/PagesAllocator.cpp
index 60f06e5c22..816e133f2c 100644
--- a/src/system/libroot/posix/malloc/openbsd/PagesAllocator.cpp
+++ b/src/system/libroot/posix/malloc/openbsd/PagesAllocator.cpp
@@ -32,6 +32,9 @@ static const size_t kReserveAddressSpace = 128 * 1024 * 1024;
 /*! Cache up to this many percentage points of free memory (compared to used.) */
 static const size_t kFreePercentage = 25;
 
+/*! Always forbid more free memory than this, even if it's below kFreePercentage. */
+static const size_t kFreeMaximum = 128 * 1024 * 1024;
+
 /*! Always allow this much free memory, even if it's above kFreePercentage. */
 static const size_t kFreeMinimum = 128 * kPageSize;
 
@@ -252,6 +255,7 @@ public:
 				}
 				chunk = previousChunk;
 			}
+
 			status_t status = _UnlockingRemoveAndUnmap(chunk);
 			if (status != B_OK)
 				return status;
@@ -320,6 +324,8 @@ private:
 		size_t freeLimit = ((fUsed * kFreePercentage) / 100);
 		if (freeLimit < kFreeMinimum)
 			freeLimit = kFreeMinimum;
+		else if (freeLimit > kFreeMaximum)
+			freeLimit = kFreeMaximum;
 		else
 			freeLimit = (freeLimit + (kPageSize - 1)) & ~(kPageSize - 1);
 		return freeLimit;